fix: improve confusing TS1107 error for mislabeled jump targets

[AkaHarshit]

Problem
Prior to this fix, the TypeScript compiler would eagerly output the confusing error TS1107: Jump target cannot cross function boundary. whenever a jump target check reached a function boundary, even if the label existed nowhere in the code and should just be a regular "invalid label target" error.

Solution
Modified checkGrammarBreakOrContinueStatement inside src/compiler/checker.ts to keep traversing the ancestor chain while remembering that a function boundary was crossed. If it actually finds the label after crossing a function boundary, only then will it output TS1107. Otherwise, it falls back to the native label missing errors such as TS1104 or TS1116.

Testing

• Built the compiler to ensure syntax works
• Added specific compiler test tests/cases/compiler/issue30408.ts containing the reproduction code.
• Generated updated compiler test baselines across the legacy test suite.

Fixes: #30408

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