fix(python): Release GIL in gather_with_series()
and friend
#19383
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Fixes the reported part of #19358, but there may be other similar regressions as yet unreported.
Given that caveat, @ritchie46 also wanted to (temporarily) revert #19199 too since that's what made this regression start happening.
The full fix will be #19382, after which #19199 can be reapplied.