Resolve CE/EE diffs in zero_authorized_projects

Closes #6351

See merge request gitlab-org/gitlab-ee!12614

Resolve CE/EE diffs in devise ldap tabs

Closes #6218

See merge request gitlab-org/gitlab-ee!12602

Add link to next badge

Closes #61503

See merge request gitlab-org/gitlab-ce!28162

Hide dependency proxy UI if feature is disabled

Closes #11583

See merge request gitlab-org/gitlab-ee!12649

Add correlation id to all sentry errors

Closes #61699

See merge request gitlab-org/gitlab-ce!28253

Fix typo

See merge request gitlab-org/gitlab-ce!28276

Update vulnerabilities.md - Add unstable note

See merge request gitlab-org/gitlab-ee!12638

Optimise upload path calls

See merge request gitlab-org/gitlab-ce!28264

String#underscore isn't particularly slow, but it's possible for us to
call it many times in a users autocomplete request, with mostly-static
values ('User', 'Group', etc.). We can memoise this and save a
surprising amount of time (around 10% of the total request time in some
cases).

Hide group -> dependency proxy page if feature is disabled globally
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Fix hiding of quick action prompt in specs

See merge request gitlab-org/gitlab-ce!28285

[EE] Fix hiding of quick action prompt in specs

See merge request gitlab-org/gitlab-ee!12656

delete feature flag when disabling Rugged

See merge request gitlab-org/gitlab-ce!28289

EE Backport to CE of EE!12404

See merge request gitlab-org/gitlab-ce!28292

Extracted EE specific lines from favicon_spec.rb

See merge request gitlab-org/gitlab-ee!12404

Fix project visibility level validation

Closes #59379

See merge request gitlab-org/gitlab-ce!28305

Rename methods that conflict in Rails 5.2

Closes #55583

See merge request gitlab-org/gitlab-ce!28281

Use real mermaid for mermaid result

See merge request gitlab-org/gitlab-ce!28300

First iteration of documentation for writing end-to-end tests

See merge request gitlab-org/gitlab-ce!27603

framework that intends to make easier for every engineer to
contribute with the end-to-end tests creation, edition, and
improvements.

Improve installation from source

Closes #47483, #61549, and #50937

See merge request gitlab-org/gitlab-ce!28201

* Add a solution for JavaScript heap out of memory error when compiling
assets
* Add note about postgres database config
* Start gitaly before gitlab:setup as it won't work otherwise
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>