TST: Add regression test for DatetimeIndex.union across DST boundary (#62915) #63223
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doc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.AGENTS.md.This PR adds a regression test for #62915.
The bug was that
DatetimeIndex.unionwould fail with anAssertionErrorwhen one index ended at a DST (Daylight Saving Time) boundary and the other extended past it. This was fixed by commit 1bd1830 and this test ensures the fix is not regressed.