Fix CI build

[jchen293]

Description

CI build is currently failing due to a doc generation tool introduced into our examples submodule a few months ago using pytest and has its own conftest.py file to execute, which causes build failing _pytest.pathlib.ImportPathMismatchError:

Add pytest.ini config file to tell pytest only look in the tests directory when running test suite.

Testing

Pull Request Type

Please select the option(s) that are relevant to this PR.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Improvement (fixing a typo, updating readme, renaming a variable name, etc)