Fix slow Bootstrap modal selector

Stanislav Lashmanovrequested to merge
slashmanov/fix-slow-modal-selector into master

What does this MR do and why?

This MR fixes extremely slow Bootstrap modal selector, which caused a major slowdown in Rapid Diffs after a modal window was opened.

This selector was originally introduced by this MR and it can be simplified since we already fully migrated to panels.

Screenshots or screen recordings

Before After
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How to set up and validate locally

  1. Enable rapid_diffs_on_commit_show feature flag
  2. Go to any commit
  3. Start a new comment on any diff line
  4. Cancel your comment
  5. Move your mouse to see the new discussion button move with the cursor
  6. Observe no lag

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