fix(test): stabilize flaky EventGroupingInfo rendering test

[JoshuaKGoldberg]

Previously, groupingInfoSection.spec.tsx was testing the GroupingInfoSection component: but all that component does is combine the InterimSection component with a lazy-loaded GroupingInfo component. That lazy-loading can take >=100-150ms locally, and might be the cause of flake in CI.

This PR changes the test to:

• Directly test GroupingInfo, bypassing the lazy-load
• Delete the specific flaky test that was checking for the component being loaded after click (since that's covered by FoldSection's unit tests, as rendered by InterimSection)

Fixes ENG-7209

Note that CI Jest tests are failing because the Frontend: Rerun Flaky Tests (not yet in use) Known flaky tests should be run many times, just to be safe. label is causing other, still-flaky tests to be run. Rebased on master so the it.isKnownFlake (#111860) addition isn't here yet.

Made with Cursor

Co-authored-by: @nikkikapadia

[linear-code]

ENG-7209 Flaky test: static/app/components/events/groupingInfo/groupingInfoSection.spec.tsx

[github-actions]

🚨 Warning: This pull request contains Frontend and Backend changes!

It's discouraged to make changes to Sentry's Frontend and Backend in a single pull request. The Frontend and Backend are not atomically deployed. If the changes are interdependent of each other, they must be separated into two pull requests and be made forward or backwards compatible, such that the Backend or Frontend can be safely deployed independently.

Have questions? Please ask in the #discuss-dev-infra channel.

[JoshuaKGoldberg]

[Question] Is there a different team we should put for this? Because this is more of a shared component / issues page point, which is outside of data-browsing, right? ❓

[scttcper]

thanks for fixing!

[JoshuaKGoldberg]

This PR's test is particularly flaky, and showing up in #111860 a lot (e.g. https://github.com/getsentry/sentry/actions/runs/23913904794/job/69742763778?pr=111860). I'm going to draft this PR, retarget to master, and merge this PR first.