Improve LCP for Release_Release_List

As part of a broader initiative to improve site speed and usability, we need to prioritize LCP Performance for Release stage endpoints.

Ops LCP Dashboard Preparation Sheet: https://docs.google.com/spreadsheets/d/1fGaK4JijJhJHub5xUFeV3OvoxF-30Px_J4llVUjWzys/edit#gid=0

Graphana LCP dashboard: https://dashboards.gitlab.net/d/sftijGFMz/sitespeed-lcp-leaderboard?from=now-30d&orgId=1&to=now&var-base=sitespeed_io&var-browser=chrome&var-connectivity=cable&var-function=median&var-group=gitlab_com&var-page=_gitlab-org_gitlab-foss_merge_requests_12419&var-path=desktop

We did some initial improvements with #238194 (comment 485079525) but our LCP still requires further optimization. Ideally we should reach an LCP < 2.5s.