Preserve TS2307 in concurrent mode for import/export declarations inside non-scope blocks

[Copilot]

Concurrent mode was dropping module-resolution diagnostics (TS2307) for import/export ... from declarations that appear in containers that do not create declaration scope (e.g. bare blocks, control-flow statement bodies), while --singleThreaded and TS 6.0 reported both TS1233 and TS2307.

• Diagnostic behavior alignment

  • Ensure module-resolution diagnostics are still produced for invalidly placed import/export declarations in non-scope blocks.
  • Keep existing top-level-placement error behavior (e.g. TS1233) unchanged while preserving TS2307 instead of losing it in concurrent execution.

• Regression coverage

  • Add a minimal compiler test case covering export { a } from "m" inside a bare block (and equivalent non-scope-container shape) to lock in dual-diagnostic behavior.
  • Update expected baselines to reflect that concurrent/default mode now matches single-threaded behavior for this case.

• Why this matters

  • Prevents silent false negatives in default mode where users otherwise miss unresolved-module errors for syntactically invalid but still module-referencing declarations.

{
    export { a } from "m";
}
// Expected diagnostics include both:
// - TS1233 (invalid placement)
// - TS2307 (cannot find module "m")

• Fixes Default concurrent mode misses TS2307 that --singleThreaded (and TS 6.0) report, for import/export declarations inside non-scope blocks #4834

[Ryan Cavanaugh (RyanCavanaugh)]

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