fix(typescript): keep non-latin letters in enum keys

TH
16h ago
+15-2

toEnumVarName in AbstractTypeScriptClientCodegen strips chars with ASCII \W, so enum values like À, Москва or 日本語 end up with empty key and generated code is { : 'À' }, which is TS1136 in every typescript-* generator with default settings
Now if nothing is left after sanitizeName, value is sanitized again with unicode (?U)\W, so Москва gives Москва: 'Москва'

I know allowUnicodeIdentifiers exists and gives valid output, but default output should not be invalid TypeScript. Only keys that are empty today change, anything that already produced non-empty key is untouchd (Café is still Caf, Москва 2 is still _2). Same idea as #24427, default sanitization fixed in this class without new option

Added test with À, Москва and Нур-Султан in TypeScriptAngularClientCodegenTest, it fails on master (expected [À] but found [])

Full ./mvnw clean package passes apart from Kotlin tests (embedded Kotlin compiler fails on my JDK 25). Regenerated all 93 bin/configs/typescript*.yaml, no sample changes. Did not run other configs, only typescript abstract class is touched. Generated typescript-angular and typescript-fetch for a spec with À and Москва enums pass tsc --strict, typescript-axios has no syntax errors (only missing axios module in my scratch dir)

This is typescript part of #16928, dart part is not touched

Fixes #9739

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Summary by cubic

Fixes toEnumVarName in AbstractTypeScriptClientCodegen so enum values containing only non-Latin characters no longer produce invalid TypeScript like { : 'Москва' }.

  • When ASCII sanitization strips everything, the value is re-sanitized with a Unicode-aware pattern, keeping letters such as À, Москва, or Нур-Султан.
  • Values that already produce a non-empty key are unchanged (Café still becomes Caf).
  • Adds tests for non-Latin enum values in TypeScriptAngularClientCodegenTest and fixes #9739.