Try to deflake unit test RoundRobinSubcompactionsAgainstPressureToken
#13254
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Summary: unit test
RoundRobinSubcompactionsAgainstPressureToken.PressureTokenTest
has been flaky. num_planned_subcompactions can be 1 for two reasons: compactions not having enough input files or that there were not enough bg threads. This PR updates the test to try to trigger a larger compaction for subcompactions, and added a callback to verify compactions have enough input files.Test plan: monitor future failure.