Purely rely on e2e tests for exercising the generator

[jviotti]

Signed-off-by: Juan Cruz Viotti jv@jviotti.com

[augmentcode]

🤖 Augment PR Summary

Summary: This PR switches generator validation to rely solely on the TypeScript end-to-end (E2E) test suite.

Changes:

• Removed the C++ generator unit test target (test/generator) from the test build.
• Deleted the large generator_typescript_test.cc suite that asserted generator output via IR construction.
• Added new TypeScript E2E fixtures for Draft 2020-12 covering complex enum values, recursive $ref schemas, and special JSON property names.
• Each new fixture includes schema.json, options.json, an expected.d.ts golden file, and a test.ts type-check program.

Technical Notes: The E2E harness compares generated output against expected.d.ts and runs tsc --strict --noEmit over the fixture to ensure the generated declarations are usable by TypeScript.

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[augmentcode]

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