pkg/runtest: detect and ignore flakes

Add retry logic that detects and ignores episodic flakes.
This test episodically flakes on syzbot.
We run with the default timeout, but require a test
to pass in 50+% of cases.
Running 72 test binaries in parallel I am getting 35-44 failures out of 72
with 1 retry. With 3 retries it drops to ~7. With 5 it is close to 0.
Use 7 retries for now. Let's see if it still flakes.

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