Add IID headers to E-Mail notifications

Closes #52477

See merge request gitlab-org/gitlab-ce!22263

Fixed file templates not clearing in Web IDE

Closes #52487

See merge request gitlab-org/gitlab-ce!22357

Document linguist overriding

See merge request gitlab-org/gitlab-ce!22386

Fixes diff stats not being visible with performance bar

See merge request gitlab-org/gitlab-ce!22390

Disable artifact validation for download action

See merge request gitlab-org/gitlab-ce!22300

Use grpc v1.15.x

See merge request gitlab-org/gitlab-ce!22350

These headers can be used to build URLs for API requests. Good examples
would be Issues and Merge Requests

Update git and install git-lfs QA docker image

See merge request gitlab-org/gitlab-ce!22355

Project::ClustersController spec improvement

See merge request gitlab-org/gitlab-ce!22346

Users report that some languages aren't detected, or at least not
reported. This is mostly due to the fact that these languages aren't
programming languages, according to Linguist.

Originally noted in: https://gitlab.com/gitlab-org/gitlab-ce/issues/50705#note_99600216

Related: https://gitlab.com/gitlab-org/gitlab-ce/issues/51995

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

It has been pointed out that `go` is used quite extensively so it's not
an unknown idiam here at GitLab. And we have arguments with `go` which
is a plus.

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