In microbenchmarks, ensure flutter quits by sending q to stdin
#19400
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This isn't perfect, but it seems unlikely this behaviour will change (and if it does, this will likely just silently do nothing) but it does reliably result in Flutter quitting, whereas without this it hangs around until it's either forcefully killed at the end of the entire run, or the next app install forces it to quit.
Fixes #19208.