Add guidelines in doc linking with HAML

## What does this MR do?

Add guidelines and examples of HAML links to
the buil-in help GitLab exposes under /help.

See merge request !7798

Replace static fixture for zen_mode_spec

## What does this MR do?

Replace `zen_mode.html.haml` for `zen_mode_spec.js` by already existing dynamically generated fixture.

## What are the relevant issue numbers?

#24753

See merge request !7686

[ci skip]

Add `.find` poly

## What does this MR do?

Adds `[].find()` poly

## Are there points in the code the reviewer needs to double check?

## Why was this MR needed?

## Screenshots (if relevant)

## Does this MR meet the acceptance criteria?

- [ ] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

See merge request !7710

Create dynamic fixture for build_spec

## What does this MR do?

Replace `spec/javascripts/fixtures/build.html.haml` by a dynamically created fixture (using `rake teaspoon:fixtures`).

## Why was this MR needed?

The existing fixture was not representing the real page. 

## What are the relevant issue numbers?

#24614 would have been avoided

following !6059

See merge request !7589

Create tag after running pre-hooks and pass updated SHA to post-hooks

Closes #24813

See merge request !7700

We only know the tag SHA after we create the tag.
This means that we pass a different value to the hooks that happen before
creating the tag, and a different value to the hooks that happen after
creating the tag.

This is not an ideal situation, but it is a trade-off we decided to
make. For discussion of the alternatives please refer to
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7700#note_18982873

"pre-receive" and "update" hooks always get the SHA of the commit
that the tag points to. "post-receive" gets the tag SHA if it is
an annotated tag or the commit SHA if it is an lightweight tag.
Currently we always create annotated tags if UI is used.

Prevent error when submitting a merge request and pipeline is not defined

Closes #24860

See merge request !7707

This reverts commit ae51774b.

Refactor issuable_filters_present to reduce duplications

See https://gitlab.com/gitlab-org/gitlab-ce/issues/23546

See merge request !7776

Pass `--load-images=no` to PhantomJS via Capybara/Poltergeist

We were unintentionally hitting `gravatar.com` whenever a test that used
Poltergeist was run. This was certainly wasting their resources and
slowing down our tests even further, for no reason.

Part of https://gitlab.com/gitlab-org/gitlab-ce/issues/24899

See merge request !7781

Speed up Project security access specs

Prior, every single test was creating four `ProjectMember` objects, each
of which created one `User` record, even though each test only used
_one_ of those Users, if any.

Now each test only creates the single user record it needs, if it needs
one. This shaves minutes off of each spec file changed here.

Part of https://gitlab.com/gitlab-org/gitlab-ce/issues/24899

See merge request !7779

https://gitlab.com/gitlab-org/gitlab-ce/issues/23546

Prior, every single test was creating four `ProjectMember` objects, each
of which created one `User` record, even though each test only used
_one_ of those Users, if any.

Now each test only creates the single user record it needs, if it needs
one. This shaves minutes off of each spec file changed here.

Fix a broken link and avoid potential creation of future broken links on the help page.

See merge request !7582

We were unintentionally hitting `gravatar.com` whenever a test that used
Poltergeist was run. This was certainly wasting their resources and
slowing down our tests even further, for no reason.

Remove unnecessary require_relative calls from finder

Rails add all from app to autoload. See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7601

See merge request !7768

This moves methods from `LfsHelper` to a new `LfsRequest` concern and
introduces a new `WorkhorseRequest` concern.

Closes #22253

See merge request !7623

Backport groups_helper refactor from gitlab-org/gitlab-ee!904

This is a simple backport from a change in `groups_helper.rb` introduced by gitlab-org/gitlab-ee!904, requested here: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/904#note_18894726

See merge request !7767

Refresh project authorizations using a Redis lease

This MR changes `User#refresh_authorized_projects` so it uses a Redis lease instead of relying on serializable transactions. See the commit message(s) for more details.

See merge request !7733

Remove caching of events data

This MR removes the caching of events data as this was deemed unnecessary while increasing load on the database. See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6578#note_18864037 and 5371da34 for more information.

See merge request !6578

UX Guide: Anchor hover guidance include color change

Update guidance on anchor hover treatment in UX Guide

See merge request !7639

Primary and secondary links should be dark blue on hover

Update anchor image to dark blue for secondary

Clean up markdown

Fix anchorlinks image

UX Guide: add guidance for max height for dropdowns

Added guidance to the Components page of the UX Guide, documenting the recommend max height for a dropdown.

See merge request !7766

Fix spelling

Update GitLab Workhorse to v1.0.1

v1.0.0 was wrongly tagged, causing compiled gitlab-workhorse binaries to misreport their version number.

Closes https://gitlab.com/gitlab-org/gitlab-workhorse/issues/77

See merge request !7759

Allow dots in group names to pass validation for Create Group and Edit Group forms

## What does this MR do?
Allows dots within group names to pass form validation when creating or editing a group.

## Are there points in the code the reviewer needs to double check?
Nope, pretty straight forward.

## Why was this MR needed?
Although group names with dots are allowed, our frontend validation mistakenly invalidates them

## Screenshots (if relevant)

#### Before:
![Screen_Shot_2016-11-23_at_4.55.03_PM](/uploads/006ee5f694de1c98e0df0b0ccd3807ee/Screen_Shot_2016-11-23_at_4.55.03_PM.png)

#### After:
![Screen_Shot_2016-11-23_at_4.52.42_PM](/uploads/693f112fb309005b0df714b32c99f25e/Screen_Shot_2016-11-23_at_4.52.42_PM.png)  
![Screen_Shot_2016-11-23_at_4.51.53_PM](/uploads/7bdb5fca92995d18a7f38d9150eb260c/Screen_Shot_2016-11-23_at_4.51.53_PM.png)  

## Does this MR meet the acceptance criteria?

- [ ] ~~[Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added~~
- [ ] ~~[Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)~~
- [ ] ~~API support added~~
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

Related to: #24622
Closes #24903

See merge request !7723

The links in the help page may be modified. This new test checks that
URLs in this page are absolute and do not depend on the presence of a
trailing slash in the URL.
Signed-off-by: David Wagner <david@marvid.fr>

Expose coverage on GET pipelines/:id

Closes gitlab-org/gitlab-ce#24801

See merge request !7670

[ci skip]

v1.0.0 was mistakenly tagged with a lightweight, rather than annotated, tag,
which caused compiled versions of workhorse to wrongly report their version.

Fix: Timeout creating and viewing merge request for binary file

See merge request !7713

Remove unnecessary sentences for return codes in the API documentation

Closes #24534

See merge request !7511