test(node-integration): Migrate to Vitest

[timfish]

ref #11084

Sorry for the huge PR, it was quite unavoidable! Vitest doesn't support the done callback that most Node integration tests used with Jest.

This PR:

• Modifies all tests to:
  • Use Vitest imports
  • Use async rather than callback
• Changes test runner and test server to be async
  • runner.start(done) becomes await runner.start().completed()
  • createTestServer() close function now throws any errors that occurred

[AbhiPrasad]

Seems like vitest shaves off ~20 seconds from looking at CI and comparing locally as well.