Revert "Merge pull request #25880 from ryandv/fix_performance_regression_in_timewithzone_to_time"
Revert "Merge pull request #25880 from ryandv/fix_performance_regression_in_timewithzone_to_time"

Turns out trying to cache on localtime with arguments is too hard
so we'll do it on DateAndTime::Compatibility#to_time instead.

This reverts commit 3132fa6b7d9585e04eb44b25b55d298391b040b5, reversing
changes made to 6949f8e5e7dc901d4e04ebab6c975afb33ca44c9.

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