Resolve various database deprecation warnings

See merge request gitlab-org/gitlab-ce!23772

Refactor Project#create_or_update_import_data

See merge request gitlab-org/gitlab-ce!23701

Do not save user preferences on read-only mode

Closes #55024

See merge request gitlab-org/gitlab-ce!23698

The use of `table_exists?` in the opclasses support initializer triggers
a deprecation warning. Using `data_source_exists?` removes this
deprecation.

Extending from ActiveRecord::Migration is deprecated, but was still used
in a bunch of places.

Add basic implementation of CI/CD bridge job

See merge request gitlab-org/gitlab-ce!23730

Wait for push before trying to create a new MR

See merge request gitlab-org/gitlab-ce!23745

Fix creation query for pools repository

See merge request gitlab-org/gitlab-ce!23729

Send a notification email on mirror update errors

Closes #54650

See merge request gitlab-org/gitlab-ce!23595

Update automatic merging documentation

See merge request gitlab-org/gitlab-ce!23689

Specify sass ~> 3.5 in Gemfile

See merge request gitlab-org/gitlab-ce!23716

Docs: Add spaces before code snippets in vuex.md

See merge request gitlab-org/gitlab-ce!23737

Fix issuables sort direction button parameters

Closes #55133

See merge request gitlab-org/gitlab-ce!23744

Documentation: Content corrections for reCAPTCHA docs

See merge request gitlab-org/gitlab-ce!23667

add information about how merge requests related to forks are processed

See merge request gitlab-org/gitlab-ce!23764

Add docs to help choose the best GitLab installation method

Closes #54308

See merge request gitlab-org/gitlab-ce!23254

Add hyperlinks to ci yaml documentation

See merge request gitlab-org/gitlab-ce!23674

Update README.md

See merge request gitlab-org/gitlab-ce!23672

Remove incorrect example Rack Attack configuration

Closes #54983

See merge request gitlab-org/gitlab-ce!23742

the added note describes code from https://gitlab.com/gitlab-org/gitlab-ee/blob/master/lib/gitlab/import_export/merge_request_parser.rb#L15

Fix ConstantName rubocop offense

See merge request gitlab-org/gitlab-ce!23677

Fixed emoji awards not being added to notes

Closes #55141

See merge request gitlab-org/gitlab-ce!23720

Increase the debounce of Issue Suggestions

See merge request gitlab-org/gitlab-ce!23721

Remove unnecessary div from MarkdownField to apply list styles correctly

Closes #55190

See merge request gitlab-org/gitlab-ce!23733

The email is sent to project maintainers containing the last mirror
update error. This will allow maintainers to set alarms and react
accordingly.

Docs: Enable gitlab-docs lint

Closes gitlab-com/gitlab-docs#305

See merge request gitlab-org/gitlab-ce!23748

[CE] Fix DiffCheck failing due to invalid string argument

See merge request gitlab-org/gitlab-ce!23741

Docs: Fix links to sections that were moved

See merge request gitlab-org/gitlab-ce!23750

Add spec for plain diff/email patch

Closes #52696

See merge request gitlab-org/gitlab-ce!23529

Check that yarn version is at least 1.10.0

See merge request gitlab-org/gitlab-ce!23612

Fix a potential frozen string error in app/mailers/notify.rb

Closes #55183

See merge request gitlab-org/gitlab-ce!23728

Migrate timeline_entry_item_spec.js to Jest

See merge request gitlab-org/gitlab-ce!23686