ci: Add workflow to detect flaky tests #7497
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This adds a new script & workflow that can be run to detect flaky tests.
It runs tests a given amount of times (10 to try it out), and logs errors if they happen, else log the average run time (note this is a bit ~~ as it just takes the duration to run the given test, separated by run count - so parallelization will skew this a bit. Still it should give a decent insight how long a given test takes).
Update:
This now runs automatically on PRs that change any browser integration tests. It will run all changed integration tests 100x, separate from the rest of the integration tests.
note that this is not merge blocking, but will report if it fails.
You can also choose to run this manually via workflow_dispatch, in which case it will run all tests 5x (for now).