[🍒 6.2] Fix String interpolation accepts invalid argument label syntax without expression #80950
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🍒 #80928
Explanation: The patch from #80928 fixes false-negative on invalid syntax related to String Interpolation with trailing comma: #80927.
Scope: Parser/syntax, related to String Interpolation with trailing comma. won't break existing code that has valid syntax.
Issues: #80927
Testing: Added test to test suite
Risk: Low. the compiler only fixes false-negative on invalid syntax.
Original PRs: #80928
Reviewers: @rintaro