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383c85ae6f
Since d335a82859 ScriptExecutors now take
a timeout duration instead of a context. This broke the script check
removal code which used context cancelation propagation to remove
script checks while they were executing.
This commit adds a wrapper around ScriptExecutors that obeys context
cancelation again. The only downside is that it leaks a goroutine until
the underlying Exec call completes or timeouts.
Since check removal is relatively rare, check timeouts usually low, and
scripts usually fast, the risk of leaking a goroutine seems very small.