BUG: Fortify string casts against floating point warnings #22868
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Backport of #22855.
Backport of #22874.
This removes the check for floating point warnings, which is enough in practice. (In principle ufuncs or structured dtypes can chain casts in a way that causes us to check anyway.)
It also checks for isfinite in the scalar repr code so the warnings shouldn't be set to begin with.
Closes gh-22843
Fixes gh-22855