This MR adds the Maintenance Mode
settings to the Admin/Application settings.

The Backend has not been implemented yet,
so this MR is stricly the UI behind a
feature flag :maintenance_mode.

This MR sets up the Vue bootstrapping
and fields for when the backend is ready.

fix missing curly brackets in API call

See merge request gitlab-org/gitlab!28118

Merge branch '197310-geo-improve-performance-of-registry-backfill-service-with-bulk-insert' into 'master'

Geo - Improve performance of RegistryBackfillService with bulk insert

Closes #197310

See merge request gitlab-org/gitlab!27720

We should use BulkInsertSafe where possible.

Cop for with_lock_retries without DDL transaction

See merge request gitlab-org/gitlab!28132

This change adds a rubocop check for ensuring that `with_lock_retries`
is not used with disabled DDL transactions.

Move issue/epic hierarchy items to a tooltip

Closes #197491

See merge request gitlab-org/gitlab!27969

Merge branch '197957-projects-api-improve-response-time-for-created_at-desc-order-and-visibility-internal' into 'master'

Fix slow API response for internal projects sorted by reverse created_at

See merge request gitlab-org/gitlab!28038

Add a new index to support descending searches of internal projects,
which are slow due to sparseness and distribution of the data.

Merge branch '207401-encrypt-decrypt-object-storage-to-support-terraform-state-backend' into 'master'

Add Terraform state model with encrypted uploader

Closes #207401

See merge request gitlab-org/gitlab!26619

Use the new Security Dashboard Layout

See merge request gitlab-org/gitlab!28106

Optimize ci_builds counters for non MAU

See merge request gitlab-org/gitlab!28027

Support design notes in url generator

Closes #212091

See merge request gitlab-org/gitlab!27840

This ensures that we can serve events on the activity feed that are
notes on designs

Remove GitHub OAuth e2e spec

Closes #196517

See merge request gitlab-org/gitlab!27997

Remove feature flag for creating pipelines in Sidekiq

See merge request gitlab-org/gitlab!28024

Fix broken link for push rule documentation

Closes #30749

See merge request gitlab-org/gitlab!28000

Indicate whether the alert is firing

See merge request gitlab-org/gitlab!27825

Configure additional rails hosts with env variable

See merge request gitlab-org/gitlab!28133

Mock gitlab-ui popover directive and component

See merge request gitlab-org/gitlab!27995

Add requirement counts to GraphqQL

See merge request gitlab-org/gitlab!27793

Expose requirement counts on project type in GraphQL

Enable Style/NestedParenthesizedCalls cop

See merge request gitlab-org/gitlab!28042

Prepare OpenProjectService

See merge request gitlab-org/gitlab!28012

Convert jira issues to gitlab issues

See merge request gitlab-org/gitlab!27201

Hide health status when feature is not available

See merge request gitlab-org/gitlab!27907

Fixes for RSpec/LeakyConstantDeclaration

See merge request gitlab-org/gitlab!27956

Add bar chart support to monitoring dashboard

See merge request gitlab-org/gitlab!27155

Tiny refactor of spam tests

See merge request gitlab-org/gitlab!28185

Convert approvals app_spec to a jest test

See merge request gitlab-org/gitlab!28069

This is the first iteraiton
- take only title and description from jira

Add filters to VulnerabilityResolver

See merge request gitlab-org/gitlab!26956

And use VulnerabilitiesFinder in VulnerabilitiesResolver

Rename the security dashboard and use the new layout

Check notes permissions (confidential notes) when sending notifications

See merge request gitlab-org/gitlab!27782

Add labels to telemetry reviewable MRs

Closes #209741

See merge request gitlab-org/gitlab!27579