This allows one to request the merge requests for a particular group,
including all of its projects and subgroups.

This functionality is not available in any other way at present.

To achieve this, a new resolver is added: GroupMergeRequestResolver,
which is tested with request tests.

The following minor additions are made:

- The merge requests factory now is able to build merge requests with
  unique authors (this is helpful to distinguish querying by project and
  by author, since otherwise they are the same).

- Abstract out include_subgroups, author and assignee filters
  this moves some filter definitions to specialised DSL
  methods, so they can be used where it makes sense without repeating the
  field definitions.

Fix Ruby 2.7 deprecation warnings in issue_activity_unique_counter_spec

See merge request gitlab-org/gitlab!43663

Removed unused inline JS

See merge request gitlab-org/gitlab!43355

Doc: Remove unneeded Overview header from pages

See merge request gitlab-org/gitlab!43796

Improve merge request diffs storage docs

See merge request gitlab-org/gitlab!43382

Hide test cases from dashboard and group issues list

See merge request gitlab-org/gitlab!44052

Split out GraphQL section of the doc style guide

See merge request gitlab-org/gitlab!43175

Update dependency vue-router to ^3.4.5

See merge request gitlab-org/gitlab!43336

Vale: Remove `admin` from SubstitutionWarning.yml

See merge request gitlab-org/gitlab!43913

Add guidance for HTTP status codes and methods

Closes #216285

See merge request gitlab-org/gitlab!43217

Treat HTTP status codes like code, and wrap them in inline code
blocks.

Describe factory_default: :keep in docs

See merge request gitlab-org/gitlab!43264

Subscription URL  to point to staging for test and dev env

See merge request gitlab-org/gitlab!43812

Remove jQuery and relpace with vue event handling

See merge request gitlab-org/gitlab!44070

Remove original Terraform replication

Closes #255951 and #254623

See merge request gitlab-org/gitlab!43341

Clarifying some info about sidekiq jobs in background migrations

See merge request gitlab-org/gitlab!41718

Replace bootstrap alerts in app/.../_form.html.haml

Closes #233647

See merge request gitlab-org/gitlab!41271

Check for default_max_patch_size changes

See merge request gitlab-org/gitlab!43778

If the value is updated by an admin, we may _want_ to display the
highlighted lines on a page, but will be unable to deliver them as the
cached version might have been set as empty ([]) when the file
PREVIOUSLY was considered "too large". When one of these situations is
detected - the file is unreadable from the cache, and would've violated
the default value but NOT violate the current value, go ahead and
manually update the cache with it.

[RUN AS-IF-FOSS] Use parent strategy for associations in factories

See merge request gitlab-org/gitlab!40274

Add some tests for fuzzy searching

See merge request gitlab-org/gitlab!43894

Replace writeData method with writeQuery

Closes #258788

See merge request gitlab-org/gitlab!44059

Move Tracing usage data ping to Core [RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!44006

Controller feature categories B-F

See merge request gitlab-org/gitlab!43873

Add screenshot for merge requests commit navigation docs

See merge request gitlab-org/gitlab!43089

Update WebAuthn UI text

See merge request gitlab-org/gitlab!43732

Fix closing code block in GitPod integration docs

See merge request gitlab-org/gitlab!43533

[RUN AS-IF-FOSS] Replace calls to `Timecop.freeze` with `travel_to`

See merge request gitlab-org/gitlab!43466

Add development guide for database partitioning

See merge request gitlab-org/gitlab!42035

Change tooltip to GlTooltip in mr_widget_missing_branch.vue

Closes #229018

See merge request gitlab-org/gitlab!43926

Calculate total excess storage for a namespace

See merge request gitlab-org/gitlab!43322