Updates the operations empty state

Closes #219763

See merge request gitlab-org/gitlab!32536

- Uses the GlEmptyState component
- Adds tests for the new component

Single source of truth for import/export compatibility

See merge request gitlab-org/gitlab!34097

Remove trial_ends_on from namespaces API

See merge request gitlab-org/gitlab!34272

Create Code Quality troubleshooting section

Closes #220263

See merge request gitlab-org/gitlab!34048

Make issue list skeletons look more like issues

See merge request gitlab-org/gitlab!33915

Resolve "Remove YAML front matter from editable content in the Static Site Editor"

See merge request gitlab-org/gitlab!33441

This was only used by our customers app. `trial_ends_on` still exists in
the API for `gitlab_subscriptions`, which is correct. The
`namespaces.trial_ends_on` column no longer exists.

Update tier of Reviews functionality

See merge request gitlab-org/gitlab!33167

It's now part of Core so documentation should reflect it.

Link `changelogs/unreleased/` to main repo rather than FOSS

See merge request gitlab-org/gitlab!34023

Lazy load commit date and authored date

Closes #217570

See merge request gitlab-org/gitlab!34181

Add security section to PlantUML documentation

Closes #18085

See merge request gitlab-org/gitlab!33061

Replace fa-file-image-o with GitLab media icon

See merge request gitlab-org/gitlab!34196

Show test report status badge on Requirements list page

Closes #215516

See merge request gitlab-org/gitlab!33848

Allow blank external_dashboard_url

See merge request gitlab-org/gitlab!33423

Remove findAssignee logic  from issue model

See merge request gitlab-org/gitlab!32238

Remove addMilestone logic from issue model

See merge request gitlab-org/gitlab!32235

Merge branch '218545-refactor-container-registry-frontend-code-to-ease-community-contribution' into 'master'

Refactor tags table to own component

Closes #219792

See merge request gitlab-org/gitlab!34059

- new component
- unit tests
- snapshots

Remove removeLabel logic to from issue model

See merge request gitlab-org/gitlab!32251

Resolve "Refactor issues analytics filter handling"

See merge request gitlab-org/gitlab!33953

Migrate issues analytics filters from being stored as a
string to an object.

Required in order to better handle transformation of params
for different endpoint requirements.

Remove removelabels logic from issues model

See merge request gitlab-org/gitlab!32252

Web IDE: Move some file props away from the file object

See merge request gitlab-org/gitlab!33870

Moved to ide_status_list.vue, and eol is computed based on file's
contents.

Remove removeMultipleIssues function logic from list model

See merge request gitlab-org/gitlab!32254

Fix default path when creating project from group template

Closes #26563

See merge request gitlab-org/gitlab!30597

Display iterations list

Closes #214713

See merge request gitlab-org/gitlab!31335

Adds a GraphQL type for Sprints as well as adding it to
Issues/Projects/Groups and adding an Issue::SetSprint and
Group::CreateSprint mutators.