Resolve "Some dropdowns have two scroll bars."

Closes #43273

See merge request gitlab-org/gitlab-ce!17665

Fix the other "A copy of ..." error for ReadOnly

Closes #44365

See merge request gitlab-org/gitlab-ce!17935

Add the /help page in robots.txt

Closes #44433

See merge request gitlab-org/gitlab-ce!17928

make a little more obvious what operations might need downtime or enhanced migration techniques

See merge request gitlab-org/gitlab-ce!17927

Same strategy with:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/17810

See:
https://stackoverflow.com/a/29710188/1992201

Frankly I don't really understand how this works and I don't really
care either. However I tried it and it does the job. To try this,
make sure you have pending migrations, and run the server, hit the site.
It would tell you that there's pending migrations, and then run
migrations, and then hit the site again.

Without this patch, Rails would complain that "A copy of ...",
with this patch, it works without problems.

Poor UX with branch whose name is very long on Branches

Closes #44386

See merge request gitlab-org/gitlab-ce!17832

Backport 4006 add weight indicator to issues board

See merge request gitlab-org/gitlab-ce!17923

Merge branch 'leipert-42037-long-instance-names-group-names-covers-namespace-dropdown' into 'master'

Prevent overflow of long instance urls during Project creation

Closes #42037

See merge request gitlab-org/gitlab-ce!17717

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

The /help page has docs which we don't want to be crawled
as we prefer the docs website instead.

Related https://gitlab.com/gitlab-org/gitlab-ce/issues/44433

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