Enables Bootsnap to GitLab (development)

Closes #45230

See merge request gitlab-org/gitlab-ce!20743

Resolve "Ability to download single file"

Closes #23705

See merge request gitlab-org/gitlab-ce!20480

Fix deserializing YAML variables when a build has been imported

Closes #49406

See merge request gitlab-org/gitlab-ce!20713

This will enable bootsnap whenver the gem is available.

Remove refs cleanup job

See merge request gitlab-org/gitlab-ce!20716

First version of pry_debugging.md

Closes #45728

See merge request gitlab-org/gitlab-ce!20740

Gitaly migrate old DB migrations

Closes gitaly#1106

See merge request gitlab-org/gitlab-ce!20708

[ci skip]

Migrate add_remote, remove_remote, fetch_internal_remote to gitaly

See merge request gitlab-org/gitlab-ce!20724

Don't overflow project/group dropdown results

Closes #49382 and #49379

See merge request gitlab-org/gitlab-ce!20704

Resolve "Web IDE crashes for directories named "blob""

Closes #48036

See merge request gitlab-org/gitlab-ce!20712

Moves CSS of security reports into CE folder

See merge request gitlab-org/gitlab-ce!20696

Closes #49382.

Backport of gitlab-org/gitlab-ee!6137

See merge request gitlab-org/gitlab-ce!20699

Add missing Gitaly branch_update nil checks

Closes #49263

See merge request gitlab-org/gitlab-ce!20711

Add a Gitlab::Profiler.print_by_total_time convenience method

See merge request gitlab-org/gitlab-ce!20715

Allow testAction to work for async actions that don't return a Promise

Closes #49413

See merge request gitlab-org/gitlab-ce!20718

This method uses Gitlab::Profiler::TotalTimeFlatPrinter internally, which is the
same as RubyProf::FlatPrinter, but the min_percent option (and new max_percent
option) applies to the _total_ time, not the _self_ time. This helps us figure
out if we're calling a library inefficiently, for instance.

Enable more frozen string in app/services/**/*.rb

See merge request gitlab-org/gitlab-ce!20702

Prior to this change, the migration touched the disk path. This has been
removed.

Further, I believe it also fixes a bug. It seems that GitLab Shell
checks if the root path exists, when the path is duplicated. For
example, if the shard is located at /home/git, it did check if
`/home/git/home/git` existed.

Introduced by f20eadcb, meant to remove
refs from Git using the wrong name. That never made it to a non-rc
release and can be safely removed now.

Remove duplicated include IgnorableColumn in user model

See merge request gitlab-org/gitlab-ce!20710

Escape username and password in UrlSanitizer#full_url

See merge request gitlab-org/gitlab-ce!20684

This old migration used Rugged to find a commit, while Gitaly is the
prefered way now. By migrating this to Gitaly, Gitaly is now a required
running component for this migration.

Part of https://gitlab.com/gitlab-org/gitaly/issues/1106

Use rugged to validate ref name

Closes #49043

See merge request gitlab-org/gitlab-ce!20669

Rails5 fix user sees revert modal spec

See merge request gitlab-org/gitlab-ce!20706

Delete UserActivities and related workers

Closes #43312

See merge request gitlab-org/gitlab-ce!20597

Add button to regenerate 2FA codes.

Closes #48408

See merge request gitlab-org/gitlab-ce!20295