chore: minor fixes/additions to big query telemetry IT tests

[ldetmer]

Some minor clean up for bigquery integration testing for telemetry based on test plan.

This PR includes:

1. renaming repo to mono repo
2. migrating attribute keys to appropriate file
3. adding check for client kind and span status, as well as validating attributes that should not be set are null
4. added missing test for telemetry disabled if flag is not set

[gemini-code-assist]

Code Review

This pull request updates the telemetry configuration by moving the SERVER_ADDRESS and SERVER_PORT attribute keys from BigQueryTelemetryTracer to HttpTracingRequestInitializer and updating the BQ_GCP_CLIENT_REPO constant. Additionally, it enhances the ITOpenTelemetryTest suite by adding assertions for span kind and status, verifying null attributes, and introducing a test case for disabled tracing. I have no feedback to provide.

[diegomarquezp]

Appropriate file

Why do we need these two attributes to be moved here?

[ldetmer]

This is where I'm setting them. I have attributes broken up by HTTP interceptors attributes set in this class and client side attributes set in HttpBigQueryRpc class. I think it makes it easier to distinguish between the 2.