Provide a BlockProviderExecutor default scale-in method #3481
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benclifford
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Prior to this PR, there was obvious-but-buggy (see issue #3471) scaling in code copy-paste shared by Work Queue and Task Vine (and prior to PR #1563 by High Throughput Executor)
This code moves that shared behavior into BlockProviderExecutor, and attempts to bugfix it there.
This PR is draft because I would like to write some tests around the scaling behaviour but don't have my head round what I want to test.
Changed Behaviour
Different blocks will be chosen for scale in - hopefully a better choice.
Fixes
#3471
Type of change