Remove TestBase assertEqualSpanInstrumentationInfo when no longer used

[tammy-baylis-swi]

Is your feature request related to a problem?

Yes, open-telemetry/opentelemetry-python-contrib#3033

Describe the solution you'd like

It would be nice if we could remove assertEqualSpanInstrumentationInfo because it results in deprecation warnings. See contrib issue open-telemetry/opentelemetry-python-contrib#3033

Maybe we could do this step-wise:

1. Remove all contrib uses (Stop TestBase DeprecationWarnings from instrumentor test span info checks opentelemetry-python-contrib#3033)
2. There doesn't seem to be any core uses (grep)
3. For a few releases, have assertEqualSpanInstrumentationInfo log warnings that it will be removed in a future release.
4. Remove assertEqualSpanInstrumentationInfo.

Describe alternatives you've considered

Or keep it forever?

Additional Context

n/a

Would you like to implement a fix?

Yes

[tammy-baylis-swi]

I think this should be a contrib issue instead. Closing.

Work on open-telemetry/opentelemetry-python-contrib#3033 first.