This adds a database migration that creates routes for any projects and
namespaces that don't already have one. We also remove the runtime code
for dynamically creating routes, as this is no longer necessary.

This removes all orphaned project and namespace routes from the "routes"
table. This is in as a preparation step for removing dynamic route
generation, as discussed in
https://gitlab.com/gitlab-org/gitlab-ce/issues/44390.

Back port ReactiveCaching

See merge request gitlab-org/gitlab-ce!20836

doc: Configuring and initializing Helm Tiller

Closes #49025

See merge request gitlab-org/gitlab-ce!20515

Prefer using direct links in docs styleguide

See merge request gitlab-org/gitlab-ce!20832

Adds rack attack disabled by default notice to documentation

See merge request gitlab-org/gitlab-ce!20833

Disable Rack Attack by default

Closes #40973

See merge request gitlab-org/gitlab-ce!16669

Enable frozen string in presenters and policies

See merge request gitlab-org/gitlab-ce!20819

i18n: externalize strings from 'app/views/layouts'

See merge request gitlab-org/gitlab-ce!19766

Bump html-pipeline to 2.8.4

See merge request gitlab-org/gitlab-ce!20828

Replace snake case in SCSS variables

See merge request gitlab-org/gitlab-ce!20799

Use limit parameter to retrieve Wikis from Gitaly

See merge request gitlab-org/gitlab-ce!20764

Fix missing ` in users.md

See merge request gitlab-org/gitlab-ce!20817

Replace author_link snake case in stylesheets, specs, and helpers

Closes #30921

See merge request gitlab-org/gitlab-ce!20797

Add frozen_string_literal to migration templates

See merge request gitlab-org/gitlab-ce!20829

Update doc/ci/docker/using_docker_build.md

Closes #48691

See merge request gitlab-org/gitlab-ce!20426

Part of #47424

In 2.8.3, it was possible to modify a constant without knowing it, which
led to a major performance regression (https://gitlab.com/gitlab-org/gitlab-ce/issues/49409).
Now attempting to modify the HTML::Pipeline::SanitizationFilter.WHITELIST will result in
"can't modify frozen Hash".

See https://github.com/jch/html-pipeline/pull/299.

Add example output for file integrity check rake task

Closes #49244

See merge request gitlab-org/gitlab-ce!20825

Fix: redirect non-SSL request for gitlab registry to valid URL

See merge request gitlab-org/gitlab-ce!20824

HTTP host and URI should not be separated by a colon. Generated URLs was looking like http://registry.examples.com:/foo. That is throwing up let's encrypt cert requests for gitlab registry.

Without this parameter, every load of a Wiki page will load all the Wiki pages
in the repository for the sidebar. This is a significant performance penalty
that can significant slow the display of all Wiki pages.

Relates to #40101

Fix slow Markdown rendering

Closes #49409

See merge request gitlab-org/gitlab-ce!20820

Enable frozen string in:

* app/presenters
* app/policies

Partially addresses #47424.

The sanitize transformers were being duplicated each time the Markdown
renderer was called, leading to expontential growth in rendering times.

The problem was that although HTML::Pipeline::SanitizationFilter.WHITELIST
is a frozen hash, the `:transformers` array can be modified. We need
to do deep copy of this to avoid adding duplicates.

Closes #49409

Add best practice points regarding background migrations on huge tables

See merge request gitlab-org/gitlab-ce!20815

Fix typo in high availability docs

See merge request gitlab-org/gitlab-ce!20805

Remove extra parenthesis in PAT docs

See merge request gitlab-org/gitlab-ce!20807

Backport various EE changes to Gitlab::Database

See merge request gitlab-org/gitlab-ce!20809