Introduce latest security changes to `master`

See merge request gitlab-org/gitlab-ce!17905

Resolve "Performance bar modal box content overflows"

Closes #44453

See merge request gitlab-org/gitlab-ce!17889

Add image for clearing the cache docs

Closes gitlab-ee#4642

See merge request gitlab-org/gitlab-ce!17932

Remove calls to clear_cache from Git::Wiki

Closes gitaly#1095

See merge request gitlab-org/gitlab-ce!17914

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/4642

Fix CI Jobs retry link

See merge request gitlab-org/gitlab-ce!17913

# Conflicts:
#   Gemfile
#   Gemfile.lock

Speed Up Pipeline Creation

See merge request gitlab-org/gitlab-ce!17443

# Conflicts:
#   app/assets/javascripts/performance_bar/components/detailed_metric.vue

Move email footer info to a single line

See merge request gitlab-org/gitlab-ce!17916

Fix performance bar spacing

See merge request gitlab-org/gitlab-ce!17912

Fix "A copy of Gitlab::Middleware::Readonly has been removed from the module

See merge request gitlab-org/gitlab-ce!17925

OmniauthInitializer created to allow testing/refactoring of code from devise.rb

See merge request gitlab-org/gitlab-ce!17881

[ci skip]

Fix "A copy of Gitlab::Middleware::Readonly has been removed from the module tree but is still active"

Similar to #34047 and #29327

Add query counts by model to profiler output

See merge request gitlab-org/gitlab-ce!17910

Disables the button when submitting comment.

Closes #39661

See merge request gitlab-org/gitlab-ce!17918

Add docs on CI caching

Closes #32515, #18945, and gitlab-runner#1621

See merge request gitlab-org/gitlab-ce!12183

Move TimeTrackingCollapsedState vue component

See merge request gitlab-org/gitlab-ce!17399

From
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/5031#note_64372406

Clarify location of Procfile for mail_room

See merge request gitlab-org/gitlab-ce!17896

- New cache page
- Move manual cache clearing to the new page
- Add all directives of cache in the yaml reference

Update omniauth 1.4.2 -> 1.8

See merge request gitlab-org/gitlab-ce!17763

They were probably added to compensate for tests shortcomings, but now
they don't complain.

Closes gitaly#1095

Backports changes made in https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/5063 to CE

See merge request gitlab-org/gitlab-ce!17909

changed wrapper to container with correct widths

[Rails5] Add `Gemfile.rails5`

See merge request gitlab-org/gitlab-ce!17761