[vm/concurrency] Add isolate stress test generation code
There are 3 parts to this CL:
* A helper script that recursively lists test suite directories, runs
tests and sees if they pass, run within reasonably time and pass
some filters. This is used to discover the set of tests that can be
included in the isolate stress test.
* A helper that reads a list of test files from a json file and
generates a stress test.
* A sanity test run on normal bots to ensure the test generation as
well as stress test compilation works (to avoid making the json file
out-of date with broken tests)
Future CLs will add a new builder that will generate and run the stress
test in various configurations.
Issue https://github.com/dart-lang/sdk/issues/36097
TEST=vm/dart{,_2}/isolates/concurrency_stress_sanity_test
Change-Id: Ib74918f4558038fff77b97b8ba880499773eefd4
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/199240
Commit-Queue: Martin Kustermann <kustermann@google.com>
Reviewed-by: Alexander Aprelev <aam@google.com>
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