Fix error when using invalid branch name when creating a new pipeline

## What does this MR do?

This MR fixes `500` error when creating a new pipeline though user interface ("Run pipeline")

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

Is this a good approach to catch those exceptions on `Repository` level?

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- Tests
  - [x] Added for this feature/bug

## What are the relevant issue numbers?

Closes #23982

See merge request !7324

Fix cache for commit status in commits list to respect branches

Fix cache for commit status in commits list to respect branches

Closes #24324

See merge request !7372

Use 'Forking in progress' title when appropriate

See merge request !7394

Resolve "Improve ee_compat_check task (part 3)"

Improve the `ee_compat_check` task with caching and keep artifacts on failure.

Closes #23945.

See merge request !7177

Import University training preso slides

## What does this MR do?

Adds missing training material from University.

## What are the relevant issue numbers?

Closes #23502

See merge request !7016

Grapify milestones API

## What are the relevant issue numbers?

Related to #22928

See merge request !7373

Grapify runners API

## What are the relevant issue numbers?

Related to #22928

See merge request !7377

Grapify the session API

## What are the relevant issue numbers?

Related to #22928

See merge request !7381

Signed-off-by: Rémy Coutable <remy@rymai.me>

Add api endpoint `/groups/owned`

See merge request !7103

[ci skip]

Remove order-dependent expectation

Fixes #24341, hopefully

See merge request !7385

Signed-off-by: Rémy Coutable <remy@rymai.me>

Add more highlighting to development docs

Now that docs.gitlab.com has lovely highlighting, we should make sure we use it
everywhere it makes sense!

See merge request !7369

Add query param to filter users by 'external' & 'blocked' type on API

Closes #23731

See merge request !7109

[ci skip]

Add a link to Git cheatsheet PDF in docs readme

See merge request !7382

[ci skip]

Change auto selection behaviour of emoji and slash commands to be more UX/Type friendly

## What does this MR do?
In the context of a special command (starting with "/", ":", ...), the MR disables auto selection of first item in the dropdown suggestion menu, until at least a character has been typed.
This behavior change originated from #22058 and #23578 in which problems with the ":" special command were pointed out.

## Are there points in the code the reviewer needs to double check?
At lines +187 and +242 there were originally no sorters. Given what ``DefaultOptions.sorter`` does, I don't think it is a problem.

## Why was this MR needed?
To solve #22058 and #23578 

## Does this MR meet the acceptance criteria?

- [X] [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?
Closes #22058 and #23578 

See merge request !7129

Improve ldap:check errors

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/21621. 

See merge request !6601

Remove an extra leading space from diff paste data

## What does this MR do?

Remove an extra leading space from diff paste data.

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

I have checked the following three patterns.

* inline diff
* parallel diff
* blob preview

## Why was this MR needed?

Diff paste data contain an extra leading space.
So it need to remove an extra leading space manually from pasted diff data.

## Screenshots (if relevant)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG.md) entry 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
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

#14176

Closes #23899

See merge request !7133

Integrate CI emails into notification system

Closes #21930

See merge request !6342

[ci skip]
Signed-off-by: Rémy Coutable <remy@rymai.me>

Restore unauthenticated access to public container registries

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/24284

See merge request !2025
Signed-off-by: Rémy Coutable <remy@rymai.me>

Respect project visibility settings in the contributions calendar

This MR fixes a number of bugs relating to access controls and date selection of events for the contributions calendar

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/23403

See merge request !2019
Signed-off-by: Rémy Coutable <remy@rymai.me>

Ensure external users are not able to clone disabled repositories.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/23788

See merge request !2017
Signed-off-by: Rémy Coutable <remy@rymai.me>

Fix for HackerOne XSS vulnerability in markdown

This is an updated blacklist patch to fix https://dev.gitlab.org/gitlab/gitlabhq/merge_requests/2007. No text is removed. Dangerous schemes/protocols and invalid URIs are left intact but not linked.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/23153

See merge request !2015
Signed-off-by: Rémy Coutable <remy@rymai.me>

disable markdown in comments when referencing disabled features

fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/23548

This MR prevents the following references when tool is disabled:

- issues
- snippets
- commits - when repo is disabled
- commit range - when repo is disabled
- milestones

This MR does not prevent references to repository files, since they are just markdown links and don't leak
information.

See merge request !2011
Signed-off-by: Rémy Coutable <remy@rymai.me>

Honour issue and merge request visibility in their respective finders

This MR fixes a security issue with the IssuesFinder and MergeRequestFinder where they would return items the user did not have permission to see. This was most visible on the issue and merge requests page for a group containing projects that had set their issues or merge requests to "private".

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/22481

See merge request !2000

[ci skip]