Disable sub_group_issuables_spec.rb for mysql

Closes #33057

See merge request !11795

Make `ActiveRecord::Migrator` idempotent again in test environment

Closes #33030

See merge request !11762

Fix alignment of tree symbols in merge requests

Closes #29590

See merge request !11761

Merge branch '19107-404-when-creating-new-milestone-or-issue-for-project-that-has-issues-disabled' into 'master'

'New issue'/'New merge request' dropdowns should show only projects with issues/merge requests feature enabled

Closes #19107

See merge request !11754

Merge branch '33048-markdown-rendering-of-md-files-has-ceased-to-display-latex-equations' into 'master'

Fix math rendering on blob pages

Closes #33048

See merge request !11793

Merge branch '33032-invalid-you-directly-addressed-yourself-todo-when-using-unsubscribe' into 'master'

Resolve "Invalid 'You directly addressed yourself' TODO when using `/unsubscribe`"

Closes #33032

See merge request !11788

Fix omniauth-google-oauth2 dependencies in Gemfile.lock

Closes #32653

See merge request !11787

`renderGFM` adds the correct syntax highlighting class and triggers KaTeX if
required.

Use 'sudo bash' when adding nodesource repository

See merge request !10527

Resolve "Browser notifications for pipeline running in a MR is gone"

Closes #32916

See merge request !11734

Set head pipeline when creating merge requests

See merge request !11669