Refactor  Cluster docs

Closes #39952

See merge request gitlab-org/gitlab-ce!15418

(cherry picked from commit d41e66cb)

644a2941 Add info about the installed apps in the Cluster docs
b7a01e08 Add info on creating your own k8s cluster from the cluster page
ee7ecc81 Add Ingress description from official docs
3b9773fc Change to Google Kubernetes Cluster and add internal links
bacf671a Move installation of apps higher

EE: Clean up schema of the "merge_requests" table

Closes gitlab-ce#31825

See merge request gitlab-org/gitlab-ee!3447

Resolve "`master` broken due to `static-analysis`"

Closes #4098

See merge request gitlab-org/gitlab-ee!3469

Fix QA test subject address by configuring capybara / EE

See merge request gitlab-org/gitlab-ee!3466

Integration tests for GitLab Geo

Closes #3765

See merge request gitlab-org/gitlab-ee!3294

(EE-port) Isolate the fork network background migrations

See merge request gitlab-org/gitlab-ee!3395

CE upstream - Wednesday

Closes gitlab-qa#103, gitaly#722, and gitlab-ce#39884

See merge request gitlab-org/gitlab-ee!3405

Signed-off-by: Rémy Coutable <remy@rymai.me>

This adds various foreign keys and indexes to the "merge_requests" table
as outlined in https://gitlab.com/gitlab-org/gitlab-ce/issues/31825.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/31825

Troubleshooting for consul, Multiple private IPs

Closes gitlab-org/build/team-tasks#31

See merge request gitlab-org/gitlab-ee!3418

Add option to remote mirrors to only push protected branches

Closes #3843

See merge request gitlab-org/gitlab-ee!3350

Remove epic sidebar props that were added by bad merge conflict

Closes #4073

See merge request gitlab-org/gitlab-ee!3441

Move EE-only admin and group views to the top-level EE directory

See merge request gitlab-org/gitlab-ee!3457

Fix linking issues from subgroups to epics in parent group

Closes #4069

See merge request gitlab-org/gitlab-ee!3445

[EE] Adds Rubocop rule for line break after guard clause

See merge request gitlab-org/gitlab-ee!3409

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

[ci skip]

Remove duplicate mixins

See merge request gitlab-org/gitlab-ee!3455

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Resolve "Add docs for gitlab slack app setup"

Closes #4043

See merge request gitlab-org/gitlab-ee!3428

Add next step link to ssh authorization geo step

Closes #4089

See merge request gitlab-org/gitlab-ee!3459

Geo: Ensure that repository deletions are communicated to the secondary

See merge request gitlab-org/gitlab-ee!3440

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Update docs for Canary monitoring - docs

See merge request gitlab-org/gitlab-ee!3438

# Conflicts:
#   db/schema.rb

(EE-port) Delete empty fork networks

See merge request gitlab-org/gitlab-ee!3451

CE Port: Add request rate limits

See merge request gitlab-org/gitlab-ee!3444