[lesnik512]

Closes #439.

Summary

• Apply the existing Sentry reporting wrapper to Starlette's integer-status exception handlers.
• Verify that default, sync, and async FastAPI handlers each report exactly one handled 503 event with request details. Disable SDK deduplication in the test so duplicate captures would fail it.
• Verify that a custom 404 handler and an explicit 503 response produce no exception events.

Verification

• Both custom handler cases captured zero events before the fix and one afterward.
• just test-ci passed with 665 tests and 100% line coverage. Ruff and ty passed.
• A focused smoke test passed on FastAPI 0.112.2 and Sentry SDK 2.70.0.