Fix MWPS doesn't work for merge request pipelines

See merge request gitlab-org/gitlab-ce!26906

Extend CTE search optimisation to projects

Closes #55170

See merge request gitlab-org/gitlab-ce!26908

Autocorrect with RSpec/ExampleWording cop

See merge request gitlab-org/gitlab-ce!26817

- rewords examples starting with 'should'
- rewords examples starting with 'it'

Note: I had to manually fixup "onlies" to "only"

Fix race condition in ApplicationSettingImplementation.create_from_defaults

Closes #59162

See merge request gitlab-org/gitlab-ce!26319

Add documentation for custom build directories

See merge request gitlab-org/gitlab-ce!20427

This adds documentation for:

- `CI_BUILDS_DIR`,
- `CI_CONCURRENT_ID`,
- `CI_CONCURRENT_PROJECT_ID`,
- `GIT_CLONE_PATH`,
- `GIT_CLEAN_FLAGS`

Adding perf testdata for MR diff tab

See merge request gitlab-org/gitlab-ce!26660

Add a service to proxy calls to Prometheus API

See merge request gitlab-org/gitlab-ce!26840

- Also refactor the get and json_api_get methods so that the get method
can be reused by the new proxy method.
- The new proxy method makes no changes to the request to the prometheus
server and response from the prometheus server. This allows it to be
used as a proxy to the Prometheus server, hence the name.

Quarantine failing tests

See merge request gitlab-org/gitlab-ce!27036

Remove EE-specific parts from FilteredSearchManager (CE-backport)

See merge request gitlab-org/gitlab-ce!27016

(cherry picked from commit a4d0b2435ff132da9bb238fea95672a6ddfd084d)

Fix IDE file dropdown

Closes #60021

See merge request gitlab-org/gitlab-ce!27015

Fix old image diff swipe view

Closes #56762

See merge request gitlab-org/gitlab-ce!26968

CE Backport: Re-use MR tabs styles to Epic tabs

See merge request gitlab-org/gitlab-ce!26935

IDE fix MR detection from fork

See merge request gitlab-org/gitlab-ce!26986

**Why?**
Currently the IDE loads a merge request based on only the
`source_branch` name. This means it loads MR's from
forks that have the same branch name (not good).

- This required updating the BE API to accept `source_project_id`

Show error when namespace/svc account missing

Closes #54506

See merge request gitlab-org/gitlab-ce!26362

Fixing single string values in the 'include:' keyword of gitlab-ci.yml validations

See merge request gitlab-org/gitlab-ce!26998

This fix is a followup to !24098 which introduced a validation of the
`include:` keyword of a gitlab-ci configuration file when triggered
from /ci/lint API calls.

However, there was a test case missing: the case of a single string as
value. I have added a test case for that which shows that the code was
not validating it correctly.

This commit fixes that to allow all `include:` valid inputs.

Fix capitalization of a sentence in CONTRIBUTING.md

See merge request gitlab-org/gitlab-ce!27021

Backport Resizable container component for gl-charts

See merge request gitlab-org/gitlab-ce!26843

* Fix up graph resize logic if navbar is collapsed

Add snapshot

Clarify the Runner registration and authentication tokens

See merge request gitlab-org/gitlab-ce!26996

MWPSService currently uses the old pipeline lookup method. It searches
related merge requests with pipeline.ref, however, this doesn't work
for attached/detached merge request pipelines.

Merge branch '9217-warn-on-git-fetch-over-ssh-if-the-secondary-is-lagging-the-primary' into 'master'

Display console messages, if available

See merge request gitlab-org/gitlab-ce!26692

Resolve "Hide Kubernetes cluster warning if project has cluster related"

See merge request gitlab-org/gitlab-ce!26749

Fix and expand Gitaly FindCommit caching

See merge request gitlab-org/gitlab-ce!27018

Fix UI anchor links after docs refactor

See merge request gitlab-org/gitlab-ce!26890

Display cluster form validation error messages inline

Closes #57602

See merge request gitlab-org/gitlab-ce!26502

Replace comment by variable

See merge request gitlab-org/gitlab-ce!27007

Instead of having a comment describing what a specific value is,
better to have a variable with a meaningful name.