[Meta] Frontend Performance

Frontend Performance

• Large issue performance (gitlab-ce#23207)
• Load Participants via Ajax (gitlab-ce#23206) WIP @lbennett (ready and waiting for backend)
• Load award emoji 1 time per page (gitlab-ce#23226 / #16161 (closed)) WIP @fatihacet
• Autocomplete is not performant (gitlab-ce#18435) Closed
• Load toolbar 1 time per page (gitlab-ce#23227) Closed
• Remove jQuery UI (gitlab-ce#18437)
• Loading large diffs (gitlab-ce#14775)
• Emoji Popup Loading Performance gitlab-ce#22474