Add missing integration test for telemetry testing

[maryamariyan]

Currently Diagnostic integration tests are skipped due to https://github.com/dotnet/razor/issues/8150

We'll want an integration test that validates the telemetry events we are interested are fired when expected.

/cc @ryzngard

[davidwengier]

Just my personal opinion, but tests for telemetry seem unnecessary to me, and I can't think how we would do them with our current testing tech without comprising the quality of the code.

[ryzngard]

I would say that integration tests specifically for telemetry are not needed, but adding telemetry checks to integration tests would be useful to validate we expect certain things to be fired