Update Redis Setup and initial SSD recommendations in HA docs

Closes gitlab-org/quality/performance#169

See merge request gitlab-org/gitlab!22517

Reflects new setup recommendations for reference architectures

Sync GitLab linked issue back to Sentry on SentryIssue creation

See merge request gitlab-org/gitlab!23007

Adds the margin back for modal buttons

Closes #196179

See merge request gitlab-org/gitlab!23327

Creates a standalone vulnerability page

See merge request gitlab-org/gitlab!20734

- Adds in the standalone vulnerabilty page
- Moves the project security dashboard page to the index
- Renders a 404 on the vulnerability page if the
`first_class_vulnerabilities` feature flag is not present.
- Updates all the path helpers and related tests
- Adds tests for the new route

Fix premailer and S/MIME emailer hooks order

Closes #197363

See merge request gitlab-org/gitlab!23293

Premailer must run before the S/MIME interceptor or signatures will be
mangled

Check if current user is present in Events api

See merge request gitlab-org/gitlab!22956

Fix feature flag check for issue link types

See merge request gitlab-org/gitlab!23264

Disallow project forking policy for anonymous user

See merge request gitlab-org/gitlab!23320

Docs: Scope approval rules by protected branches via API

See merge request gitlab-org/gitlab!22754

Clarifies additional runner minutes balance change

See merge request gitlab-org/gitlab!20979

Only check request_deadline flag once per request

Closes gitlab-com/gl-infra/scalability#104

See merge request gitlab-org/gitlab!23167

Add note to FF docs re: the precedence of gates

See merge request gitlab-org/gitlab!23206

The API returns a 500 error when scope is supplied and current_user
is not present. This is because a user's projects are used in the
query that returns all events.

This change adds a check to confirm that current_user is provided
before trying to run the query when scope is passed

Move install step for pg_trgm to later in the setup process.

See merge request gitlab-org/gitlab!23316

Display NPM tags on package details page

See merge request gitlab-org/gitlab!23061

Created new package-tags component
Updated app.vue to display new component
Replaced icon with gl-icon in app.vue
Added tests for package-tags
Updated pot file

Rename identifier_for_subject method to identifier_for_repositorable

See merge request gitlab-org/gitlab!23168

In https://gitlab.com/gitlab-org/gitlab/issues/39176 we're
allowing resources other than projects to have repositories
attached.

Therefore, we need to refactor those places where we use
project because it can also be a snippet. Besides, we need to
abstract this variable to something like repositorable.

In this commit we rename the method
GlRepository::RepoType#identifier_for_subject to
identifier_for_repositorable to align with this.

Resolve "Improve copy of pipelines in the Merge Request widget"

See merge request gitlab-org/gitlab!23199

Fix Bitbucket Server importer error handler

See merge request gitlab-org/gitlab!23310

Downgrade D3 to 4.13

See merge request gitlab-org/gitlab!23313

Cache classes in CI

See merge request gitlab-org/gitlab!20949

Fix warning: character class has duplicated range

See merge request gitlab-org/gitlab!23165

Display error message in codeclimate widget when base_path is null

See merge request gitlab-org/gitlab!21666

In the MR codeclimate widget
When the branch's base pipeline has no codeclimate artifact
Show the generic 'Failed to load codeclimate report' error message

Enable cop HaveGitlabHttpStatus in shared examples

See merge request gitlab-org/gitlab!23220

Enable Rails rubocops

See merge request gitlab-org/gitlab!23101

Use gitlab_subscription in group preloader

See merge request gitlab-org/gitlab!23184

Fix broken links

See merge request gitlab-org/gitlab!22253

Fix whitesapce hack with corrected display value

Closes #121612

See merge request gitlab-org/gitlab!22553

**Note:**
- It looks like `line_content` has `display: block`
  by default. Rather than changing this everywhere
  let's just use bootstrap util class.
- We don't know why `line_content` has
  `display: block` :/