[CI] Playwright has flaky tests

Recently it became more and more common for playwright to fail.

This issue will be used to document all occurances and related work:
An issue where the tests failed and were restarted:
https://github.com/element-hq/element-call/pull/3870

A fix for one of the failing tests:
https://github.com/element-hq/element-call/pull/3857/commits/57f12d3d1c5dc6af0815d8a593fa4d4c953d4935
In PR: https://github.com/element-hq/element-call/pull/3857

Another test run in https://github.com/element-hq/element-call/pull/3877
https://github.com/element-hq/element-call/actions/runs/24448135455/job/71429800534?pr=3877

Another flaky run: https://github.com/element-hq/element-call/pull/3857
https://github.com/element-hq/element-call/actions/runs/24461234649/job/71475731295?pr=3857