Clear stale incremental diagnostics after JSON module changes

[Copilot]

Incremental builds retained diagnostics from an earlier JSON module shape after the JSON file was fixed.

• Root cause: JSON modules used an empty declaration emit as their shape signature, so subsequent content changes appeared shape-equivalent.
• Change: Use the JSON file’s content version as its shape signature, invalidating dependent diagnostics on every content change.
• Coverage: Add a regression covering valid JSON, removal of a required property, and restoration of that property.

• Fixes --incremental: diagnostics caused by a JSON module are never cleared after the JSON file is fixed (7.0.2) #64025

[Copilot]

Pull request overview

Updates incremental compilation so JSON content changes invalidate dependent diagnostics.

Changes:

• Uses JSON file versions as shape signatures.
• Adds a regression test covering property removal and restoration.
• Adds the expected incremental-build baseline.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
tsc/internal/execute/incremental/affectedfileshandler.go	Handles JSON shape signatures correctly.
tsc/internal/execute/tsctests/tsc_test.go	Adds the regression scenario.
tsc/testdata/baselines/reference/tsc/incremental/json-module-diagnostics-are-cleared-after-fixing-the-json-file.js	Records expected diagnostics and invalidation behavior.

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[Jake Bailey (jakebailey)]

I added the comment so need a re-review.