Catch redis address error

Closes omnibus-gitlab#2545

See merge request !12542

# Conflicts:
#   lib/gitlab/current_settings.rb

Fix milestones destroy service

See merge request !12762

doc:installation add note about disable-gems for gitlab-shell

See merge request !12765

See https://gitlab.com/gitlab-org/omnibus-gitlab/merge_requests/1707#note_34351820

Adding notation about speeding up `gitlab-shell` by disabling RubyGems

Revert "Merge branch 'update_bootsnap_1.1.1' into 'master'"

See merge request !12755

Remove remaining N+1 queries in merge requests API with emojis and labels

Closes #34159

See merge request !12732

Prevent bad data being added to application settings when Redis is unavailable

Closes #34728

See merge request !12750

This reverts commit 83ec509c, reversing
changes made to 57f0677a.

Re-add Feature.register_feature_groups which is already documented

Closes #34891

See merge request !12751

This is a follow-up for !12362 where this was documented but the code
was removed in the last iteration. Since this can still be useful and
this is already supported by the API, I think re-adding the code was
the best course of action.
Signed-off-by: NRémy Coutable <remy@rymai.me>

Configure headless chrome screenshots correctly

See merge request !12746

Increase GitLab QA screenshots size

See merge request !12748

Allow passing exceptions when creating project services

See merge request !12745

Fix QA test scenario for creating a new project

Closes gitlab-qa#56

See merge request !12747

Fix offline runner detection

See merge request !11751

Exclude gitlab_git_test from docs only changes

See merge request !12703

Fix gitlab-ee reference in ee_compat_check

See merge request !12713

Prevent default click since we change the url manually

Closes #34810

See merge request !12721

Change gitlab_sign_in to sign_in

See merge request !12369

Closes #34159

Also inject new route helpers into includers of GitlabRoutingHelper

Closes #34859

See merge request !12735

Add build stage_id reference background migration

Closes #34151

See merge request !12513

Remove many N+1 queries with merge requests API

See merge request !12726

Send Gitaly Repository with /api/internal/allowed

See merge request !12452

Identified via `ENABLE_BULLET=1 bundle exec rspec spec/requests/api/merge_requests_spec.rb:34`

Improves speed of #34159

fix migrations in the future

Closes #34832

See merge request !12719

Username and password are no longer stripped from import url on import

See merge request !12725

fix milestones finder failing spec

Closes #34852

See merge request !12727