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Rollup merge of #157630 - pbkx:issue-157148-non-ascii-json, r=folkertdev
Add multibyte JSON diagnostic regression test
Closes rust-lang/rust#157148.
This pr adds ui coverage for json diagnostics with rendered ansi output on a
source line containing multibyte text.
Current main emits the original warning without ICEing. This test maintains that
behavior.
