BUG: Avoid data race in PyArray_CheckFromAny_int #28160
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* BUG: Avoid data race in PyArray_CheckFromAny_int * TST: add test * MAINT: simplify byteswapping code in PyArray_CheckFromAny_int * MAINT: drop ISBYTESWAPPED check
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Backport of #28154.
Fixes #28143.
I verified the test triggers TSAN warnings on main and doesn't anymore with this applied.
BUG: Avoid data race in PyArray_CheckFromAny_int
TST: add test
MAINT: simplify byteswapping code in PyArray_CheckFromAny_int
MAINT: drop ISBYTESWAPPED check