remove Python 2 compatibility shims and casts #14989
Merged
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If we don't want to support both Python 2 and Python 3 at the same time, a lot of compatibility shims and casts from iterators to lists can be avoided.
This PR is mostly based on regexing through #14798 and removing unnecessary changes. I tried to avoid introducing new changes.
Disclaimer: I wasn't able to run the test suite yet to make sure this doesn't introduce more errors than the parent PR. Hence the draft status.