Adds clarity around setup and features

See merge request gitlab-org/gitlab!51890

Closes https://gitlab.com/gitlab-org/gitlab/-/issues/298682

Remove code related to ci_allow_failure_with_exit_codes feature flag

See merge request gitlab-org/gitlab!51973

Include version where default max import file size was changed

See merge request gitlab-org/gitlab!51755

Edit UI text for Default Branch settings

See merge request gitlab-org/gitlab!51658

Remove docs about disabling feature flag

See merge request gitlab-org/gitlab!50506

[RUN AS-IF-FOSS] Move all the changes related to reading SAST Configuration to CE

See merge request gitlab-org/gitlab!51169

Add tooltip to design filenames

See merge request gitlab-org/gitlab!51421

Updates the related jest specs to ensure
we test for the tooltip

Adds GitLab UI styles to button in _form.html.haml

See merge request gitlab-org/gitlab!51160

Update import export limits

See merge request gitlab-org/gitlab!51819

Adds GitLab UI styles to buttons in _edit_form.html.haml

See merge request gitlab-org/gitlab!51156

Provide full link to the gitlab project in issue template

See merge request gitlab-org/gitlab!51955

Remove more references to InfluxDB

See merge request gitlab-org/gitlab!51771

Update Gitaly version

See merge request gitlab-org/gitlab!52007

Remove tier and clarify dev doc

See merge request gitlab-org/gitlab!51968

Add test for API URL slash prefixing behavior

See merge request gitlab-org/gitlab!51713

Refactor PipelineArtifact for codequality

See merge request gitlab-org/gitlab!51762

Add env var that bypasses Puma cluster validation

See merge request gitlab-org/gitlab!51906

Specify values for use with a separate Pages server

See merge request gitlab-org/gitlab!51497

Edit docs on how to get Ingress external IP

See merge request gitlab-org/gitlab!51779

This is in preparation for deprecation of GitLab-managed Ingress.
This shows clearly that you can use a manually installed Ingress for
Auto DevOps.

- Remove an old note for functionality that was removed in GitLab 12.0
- Removes some notes that were never true

Add rails log searching tips and additional root cause

See merge request gitlab-org/gitlab!51815

Document Rails upgrade steps

See merge request gitlab-org/gitlab!51569

Adds notes about things we need to keep in sync when upgrading Rails

Add stage/group metadata to raketasks

See merge request gitlab-org/gitlab!52010

Don't create duplicate deployments

See merge request gitlab-org/gitlab!47610

When the API parameters for a deployment are the same as the last
deployment no new deployment will be created. This prevents duplicate
deployments if nothing changed. As such no hooks will be executed
either, which prevents for example Slack notifications which don't add
value.

Remove jira_sync_builds feature flag [RUN ALL RSPEC] [RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!51627

Add docs on let_it_be_with_refind for licensed Features

See merge request gitlab-org/gitlab!51290

Add seperate section