[test] a bunch of `ui-mode-trace.spec.ts` tests are failing across the board

[aslushnikov]

Failing tests:

• ui-mode-trace.spec.ts:21 - should merge trace events
• ui-mode-trace.spec.ts:52 - should merge web assertion events
• ui-mode-trace.spec.ts:124 - should show snapshots for sync assertions

permalink: https://devops.playwright.dev/flakiness.html#commits=20&filter_spec=ui-mode-trace&timestamp=1684372046458