GitLab keeps a cache of the rendered HTML for a repository's README as
stored in the HEAD branch. However, it was not used in all
circumstances. In particular, the new blob viewer framework bypassed
this cache entirely.

This MR ensures a ::ReadmeBlob is returned instead of a ::Blob when
asking a repository for an individual blob, if the commit and path
match the readme for HEAD. This makes the cached HTML available to
consumers, including the blob viewer.

The ReadmeBlob is a simple delegator to the Blob, so should be
compatible in all cases. Adding the rendered_markdown method is the
only additional behaviour it contains.

Resolve "Prometheus not showing as installed, even though it is"

Closes #51972

See merge request gitlab-org/gitlab-ce!22356

Make source param optional according to EE change

See merge request gitlab-org/gitlab-ce!22283

Use InvalidUTF8ErrorHandler only for rails 4

Closes #51908

See merge request gitlab-org/gitlab-ce!22340

Before this commit updating Prometheus (e.g. adding alerts) made it
"updated" therefore not installed.

Fix typo: 9.5.8 => 9.5.10

See merge request gitlab-org/gitlab-ce!22368

Fix link to 'when delayed' YAML configuration item

See merge request gitlab-org/gitlab-ce!22349

Does not allow a SSH URI when importing a project

See merge request gitlab-org/gitlab-ce!22309

Revert "Merge branch 'ce-6983-promote-starting-a-gitlab-com-trial' into 'master'"

See merge request gitlab-org/gitlab-ce!22315

Docs: Fixes image shadow

See merge request gitlab-org/gitlab-ce!22366

Define Stage labels in issue workflow

See merge request gitlab-org/gitlab-ce!22313

docs remove reference to push rules as not yet implemented for groups

See merge request gitlab-org/gitlab-ce!22305

Replace `<i>` in vue components with `<icon>`

See merge request gitlab-org/gitlab-ce!20748

Remove Koding integration and documentation

Closes #39697

See merge request gitlab-org/gitlab-ce!22334

Allow Issue and Merge Request sidebar to be toggled from collapsed state

Closes #52532

See merge request gitlab-org/gitlab-ce!22353

Add a new QA::ElementWithPattern cop

Closes #52516

See merge request gitlab-org/gitlab-ce!22298

Allow getting the merge base of multiple revisions

Closes #52573

See merge request gitlab-org/gitlab-ce!22295

Add documentation how to assign a merge request for review

See merge request gitlab-org/gitlab-ce!21327

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

Remove dependencies on Linguist

Closes #35450

See merge request gitlab-org/gitlab-ce!21008

Refactor Cluster services to enable groups or projects

See merge request gitlab-org/gitlab-ce!22181

Fixes close/reopen quick actions preview for issues and merge_requests

Closes #52669

See merge request gitlab-org/gitlab-ce!22343

Fix code reuse issue in Projects::Clusters::ApplicationController#index

See merge request gitlab-org/gitlab-ce!22182

Merge branch '49417-improve-settings-pages-design-by-prioritizing-content-group-settings' into 'master'

Prioritize group settings, improve panel titles, disable submit without changes

Closes #49417

See merge request gitlab-org/gitlab-ce!21115

Resolve "Personal projects pagination in Profile Overview tab is broken"

Closes #52564

See merge request gitlab-org/gitlab-ce!22321

[ci skip]

Send deployment_status when job starts environment

Closes #52614

See merge request gitlab-org/gitlab-ce!22354

Use Gitaly 0.125.1

See merge request gitlab-org/gitlab-ce!22364

This cop forbids the use of `element :foo, 'pattern'` and
`element :bar, /pattern/` in QA files.
Signed-off-by: Rémy Coutable <remy@rymai.me>

The check was if the job `has_environment` which results into showing
the environment information when the job stops the environment. This
result into having a blank `deployment_status`.

Use `starts_environment?` to be the same as the haml we have in 11.3
https://gitlab.com/gitlab-org/gitlab-ce/blob/30f019dca78bb64bcb8b355a267be006884e6d8f/app/views/projects/jobs/show.html.haml#L28

Docs: fix table on API settings

Closes gitlab-com/gitlab-docs#234

See merge request gitlab-org/gitlab-ce!22083