Allow processes to occupy more than one slot in the execution semaphore #21960
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fixes #21626
Draft for early feedback on the approach.
I was able to manually test that this appears to work from the plugin side, though I plan on adding tests here once the design is agreed upon.
Slack conversation https://pantsbuild.slack.com/archives/C0D7TNJHL/p1738988769732369?thread_ts=1738988769.732369&cid=C0D7TNJHL