[Python][Pipeline Options] Recursively Get All Subclasses

[manav-glean]

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Fixes #31139 by changing the subclasses we iterate to recursively get all subclasses of PipelineOptions.

cc @rohandhoopar-glean

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[damccorm]

It looks like this is causing a bunch of test failures because its not correctly deduping items and it considers the current class multiple times. I'm guessing the set comparison isn't working correctly. Could you please take a look?

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