fix(compiler): correct module type for nodenext

[marcus-sa]

Summary of changes

Updates getModuleType to correctly reflect how TypeScript determines the module type for NodeNext.

1. If a file has .mjs or .cjs extension:

   • .mjs treat file as esm.

   • .cjs treat file as cjs.

2. If a file has .ts or .js extension:

   • TypeScript checks the nearest package.json:
     • If "type": "module", treat file as esm.
     • If "type": "commonjs" or no type field, treat file as cjs.

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[marcus-sa]

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