Only check for public symbols in public packages/modules

[aabmass]

Description

Update public symbols checker to skip files which:

• Have a path part starting with a single leading underscore, for example opentelemetry-sdk/src/opentelemetry/sdk/_metrics/__init__.py would not be checked but opentelemetry-sdk/src/opentelemetry/sdk/trace/__init__.py would be

• Have the full string tests as one of the path parts, for example opentelemetry-sdk/tests/metrics/test_metrics.py would not be checked but opentelemetry-sdk/src/opentelemetry/foo/equalitytests/foo.py would be.'

  Note this could skip a file like opentelemetry-sdk/src/opentelemetry/foo/tests/foo.py, but since some of our packages are within another directory e.g. exporter/opentelemetry-exporter-otlp-grpc I can't simply check the second path part.

Type of change

Tooling

How Has This Been Tested?

Tested by creating new commits on top that pass/fail the check, see #2459 CI run:

The code in this branch adds the following public symbols:

- opentelemetry-sdk/src/opentelemetry/sdk/trace/testsfoo.py
	Foo

- opentelemetry-sdk/src/opentelemetry/sdk/trace/__init__.py
	Foo

Please make sure that all of them are strictly necessary, if not, please consider prefixing them with an underscore to make them private. After that, please label this PR with "Skip Public API check".

Does This PR Require a Contrib Repo Change?

• No.

Checklist:

N/A

[ocelotl]

Yes! a great enhancement 😎