Updates the EnvironmentController#metrics_dashboard endpoint
to support a "dashboard" param, which can be used to specify
the filepath of a dashboard configuration from a project
repository. Dashboard configurations are expected to be
stored in .gitlab/dashboards/.

Updates dashboard post-processing steps to exclude custom
metrics, which should only display on the system dashboard.

CE Backport: Add project level config for merge train

See merge request gitlab-org/gitlab-ce!27819

Extract discussion notes into new component

Closes #58294

See merge request gitlab-org/gitlab-ce!27066

- Moved discussion notes out of `NoteableDiscussion` component into a
new `DiscussionNotes` component
- Wrote Jest tests for the new `DiscussionNotes` component
- Updated Jest config for emojis fixtures
- Updated Karma tests `NoteableDiscussion` to match its new structure
- Convert `DiffDiscussions` tests to use Vue test utils

[ci skip]

Fix webpack asset patch with '/' as relative root

See merge request gitlab-org/gitlab-ce!27909

Internationalisation of raven directory

See merge request gitlab-org/gitlab-ce!27741

This is one of many MRs opened in order to improve the overall
internationalisation of the GitLab codebase.

i18n documentation
https://docs.gitlab.com/ee/development/i18n/externalization.html

Use FIXTURES_PATH constant for binary fixtures in frontend tests

See merge request gitlab-org/gitlab-ce!27891

Remove babel environment for Jest

Closes #59164

See merge request gitlab-org/gitlab-ce!27676

Docs: Merge EE doc/analytics to CE

See merge request gitlab-org/gitlab-ce!27699

Add SSH MaxStartups documentation

See merge request gitlab-org/gitlab-ce!27837

Add isEE check in milestone

See merge request gitlab-org/gitlab-ce!27814

Improve `installation from source` documentation

See merge request gitlab-org/gitlab-ce!25530

Add missing regionendpoint documentation.

Closes #57718

See merge request gitlab-org/gitlab-ce!25297

Backport docs update for multiple assignees for MRs

See merge request gitlab-org/gitlab-ce!27221

This backports API and quick action docs.

Add guide to custom global hooks

See merge request gitlab-org/gitlab-ce!27847

Internationalisation of integrations directory

See merge request gitlab-org/gitlab-ce!27682

This is one of many MRs opened in order to improve the overall
internationalisation of the GitLab codebase.

i18n documentation
https://docs.gitlab.com/ee/development/i18n/externalization.html

Internationalisation of protected_tags directory

See merge request gitlab-org/gitlab-ce!27739

This is one of many MRs opened in order to improve the overall
internationalisation of the GitLab codebase.

i18n documentation
https://docs.gitlab.com/ee/development/i18n/externalization.html

Group project templates should be a Silver/Premium feature - CE backport

See merge request gitlab-org/gitlab-ce!27407

style: fix typo

See merge request gitlab-org/gitlab-ce!27918

Internationalisation of u2f directory

See merge request gitlab-org/gitlab-ce!27749

This is one of many MRs opened in order to improve the overall
internationalisation of the GitLab codebase.

i18n documentation
https://docs.gitlab.com/ee/development/i18n/externalization.html

feat: add option to define the Sentry Environment

See merge request gitlab-org/gitlab-ce!27091

Resolve "Referencing issues or epics by URL fails with 404"

Closes #61099 and #60965

See merge request gitlab-org/gitlab-ce!27827

Add client methods for FetchIntoObjectPool RPC

See merge request gitlab-org/gitlab-ce!27767

MVC improvements to basics landing page

See merge request gitlab-org/gitlab-ce!27865

Added content on the Admin Area's `Projects` page

See merge request gitlab-org/gitlab-ce!27447

Part of issue 57874

Clarify that `project_url` is used

See merge request gitlab-org/gitlab-ce!27163

Move EE differences for `app/views/projects/issues/_issue.html.haml`

See merge request gitlab-org/gitlab-ce!27804