* ee/master: (89 commits)
  Merge branch '36807-gc-unwanted-refs-after-import' into tmp
  EE port of remove-sidebar-title
  Make namespace dropdown on new project page consistent
  Adds CE to EE compatibility with 2756
  Fixed Test
  Back to simple headlines without specific branching
  Add my-reaction filter (EE)
  Let's do JS later
  Add a spec when ressource is not modified
  Add changelog and doc
  Add tests for the unmodified header
  Update remaining endpoints
  Use commit date for branches and tags
  Conditionally destroy a ressource
  API: Respect the 'If-Unmodified-Since' for delete endpoints
  Fixes activation of project mirror when project is created.
  Kick off the pipelines again
  Fixed the default callout_id state
  Adjustments to calling logic
  Mapped correct setup
  ...