Support open threads navigation in Rapid Diffs

Stanislav Lashmanovrequested to merge
slashmanov/rapid-diffs-discussion-navigation into master

Summary

This MR implements Support discussions navigation (#589875 - closed).

How to reproduce

  1. Enable rapid_diffs_on_mr_show feature flag
  2. Open any merge request
  3. Select 'Changes' tab
  4. Add ?rapid_diffs=true to the URL, follow it
  5. Add comments on diff lines
  6. Use open threads navigation arrows to cycle through them
Edited by Stanislav Lashmanov

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