[ci] Set timeout for individual tests and report slowest tests #76300
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There are builds like
https://buildkite.com/llvm-project/github-pull-requests/builds/24894
It looks like a deadlock in a test, but we can't see which one.
--timeout=
will make lit kill and report such tests.--time-tests
produces nice report about slowest test, so we can tunethem over time.
The same build as above with new flags
https://buildkite.com/llvm-project/github-pull-requests/builds/24961