Update Praefect docs with new connection tester subcommand

Closes gitaly#2259

See merge request gitlab-org/gitlab!23255

Updates Praefect documentation to mention new connection checker
subcommand for diagnosis of configuration and connectivity issues.

Billing address component for paid signup flow

Closes gitlab-org/growth/engineering#5052

See merge request gitlab-org/gitlab!21638

Adjust client middleware metrics Counter

See merge request gitlab-org/gitlab!23515

Use export icon instead of download in dependencies list

Closes #198059

See merge request gitlab-org/gitlab!23527

Resolve "API for protected environments"

See merge request gitlab-org/gitlab!22336

Update GitLab Packages

See merge request gitlab-org/gitlab!23459

**Notes:**
- localVue is only needed if we `use` something
- constants.*_URL don't exist anymore which
  was hurting our test coverage that the
  right calls were being made
- overwriting constants is a scary thing to do
  so added a mock for the constants to replace
  with a test STEPS array

According to https://github.com/mperham/sidekiq/wiki/Middleware
the client middleware of Sidekiq can either be a String of the class
name, of the class itself.

At this change we enforce a constantize when a String is given.

Fix top 3 Ruby runtime warnings

See merge request gitlab-org/gitlab!23509

Refactor SpamService

See merge request gitlab-org/gitlab!23236

Feature flag: look up commits without batch-check

See merge request gitlab-org/gitlab!23423

Add extra fields to the application context

See merge request gitlab-org/gitlab!22792

Commands to change user password

See merge request gitlab-org/gitlab!23580

Fix Rubocop offenses for cops with 3 offenses

See merge request gitlab-org/gitlab!23520

Remove merge_requests_conditional_mergeability_check feature flag

See merge request gitlab-org/gitlab!23450

Enable JS on 2FA page specs to catch validation errors

See merge request gitlab-org/gitlab!23514

This silences this warning:
    warning: instance variable @plan_name not initialized

Also test explicitly that blank plan names are valid.

Resolve "Broken FOSS `master` in `qa:internal`"

Closes #198393

See merge request gitlab-org/gitlab!23528

Note, the access to this variable remains thread-unsafe.

This silences the following warning:
    warning: instance variable @enabled not initialized

This avoid the warning:
    warning: instance variable @state not initialized

Payment method component for paid signup flow

See merge request gitlab-org/gitlab!21640

Limit page number on explore/projects

See merge request gitlab-org/gitlab!22876

Add that description diffs are behind flag

See merge request gitlab-org/gitlab!23451

Align project and personal snippet abilities

Closes #39087

See merge request gitlab-org/gitlab!22500

Mostly a search and replace for *_project_snippet and *_personal_snippet
abilities across app and spec files. Replaced with just *_snippet and
falling back on the type of subject to determine which policies to
apply.

There are some less trivial changes included which relate to inferring
an abilities name from the subject class. Because ProjectSnippet is a
child of Snippet there is some special handling around the place. There
is perhaps potential to clean this up a bit as there is the same logic
spread out in various locations.

Various changes required after review

- Renamed before_action names
- Fixed snippet note mailer with spec
- Removed incorrect/unecessary policy parameter
- Fix personal snippet note policy spec

Resolve "Create feature spec for loading error details page"

Closes #36695

See merge request gitlab-org/gitlab!23543

Add feature specs covering the error tracking index
and the error tracking show page. Inculde expandable
stack traces in the feature spec.

Updates documentation to state that description diffs are
behind a feature flag.

Properly document how to run a custom gitaly build

See merge request gitlab-org/gitlab!23589

Add pages_access_level to projects API

Closes #30972

See merge request gitlab-org/gitlab!23176

This is part of the paid signup flow

Fixes for payment method component

- New store in beforeEach
- Only one component instance
- Only testing component interface
Signed-off-by: Alex Buijs <abuijs@gitlab.com>

This is part of the paid signup flow

New Crowdin translations

See merge request gitlab-org/gitlab!23499

[skip ci]

Stop NoMethodError happening for 1.16+ clusters

See merge request gitlab-org/gitlab!23149