Extract Testing and reports in mrs to new docs page

Closes #118824

See merge request gitlab-org/gitlab!31852

* See https://gitlab.com/gitlab-org/gitlab/-/issues/118824
* Extract the Testing and reports in merge requests
  section of the Merge requests doc page was moved to its own document
  to make the index easier to go through.

Add suggestion for missing merge request in changelog

Closes #218752

See merge request gitlab-org/gitlab!32848

Merge branch '216749-improve-the-container-registry-ui-header-section-with-relevant-metadata' into 'master'

Improve Container Registry UI Header

See merge request gitlab-org/gitlab!32424

- new component
- change constants
- wire the new component in the list

Update upgrade policy to reflect new major version

See merge request gitlab-org/gitlab!32841

Update example port in Geo registry docs to 5050

See merge request gitlab-org/gitlab!32781

Merge branch '207497-display-warning-when-service-desk-issue-gets-moved-to-a-project-without-service-desk-enabled' into 'master'

Display warning for issues moved from service desk on frontend

See merge request gitlab-org/gitlab!31803

Displays a warning when an issue gets moved from a project with service
desk enabled to a project with service desk disabled, as this would make
the user who created the issue unable to receive email notifications
about new activity

Move base supports_weight to Issuable

See merge request gitlab-org/gitlab!33070

Update docs versioning process

See merge request gitlab-org/gitlab!33066

Clean up gitlab-shell install-from-source instructions

See merge request gitlab-org/gitlab!33057

Remove a mention of back porting code to EE from developer docs

See merge request gitlab-org/gitlab!33102

Remove trial_ends_on from namespaces

See merge request gitlab-org/gitlab!29155

Move NoPrimaryClass table def to last spec

Closes #218730

See merge request gitlab-org/gitlab!33015

Add manual pipeline run variables to priority section

See merge request gitlab-org/gitlab!32940

Remove partial word matching from code search

See merge request gitlab-org/gitlab!32771

Currently the code search uses ngrams to allow searching for prefixes as
well as full matches. This takes up a lot of storage and can be replaced
with a prefix search.
This change removes the usage of edgeNGram_filter from our index
mappings.

Add example to manually delete job logs

See merge request gitlab-org/gitlab!32653

Removed a note about pagination limitations

See merge request gitlab-org/gitlab!33141

Minor refactor extract method InstrumentationHelper

Closes #219197

See merge request gitlab-org/gitlab!33133

Fix confidential note attribute getter

See merge request gitlab-org/gitlab!32571

Fix #216731 "Fetching author API under relative url"

Closes #216731

See merge request gitlab-org/gitlab!32379

This reverts commit 414bb48a2788099befa602c1454b48db02631c66.

Add Docker to capitalization rules

See merge request gitlab-org/gitlab!33134

Assign alerts sidebar base

See merge request gitlab-org/gitlab!32642

Create vale test for unresolved merge conflicts

Closes #219168

See merge request gitlab-org/gitlab!33125

This will hopefully improve readability since this method is getting a
little long now.

Check valid confidence and severity level when parsing

See merge request gitlab-org/gitlab!33050

Introduce instrumentation for all Elasticsearch HTTP requests

Closes #214279

See merge request gitlab-org/gitlab!32822

Remove update  function logic from List model

See merge request gitlab-org/gitlab!31900