Add conftest.py to avoid absl.flags._exceptions.UnparsedFlagAccessError

[nikelite]

• Add conftest.py to avoid absl.flags._exceptions.UnparsedFlagAccessError
• Re-enable related unit-tests

[peytondmurray]

These changes don't look like they modify the pytest configuration - did I miss something here? Only looks like install constraints were changed.

[nikelite]

These changes don't look like they modify the pytest configuration - did I miss something here? Only looks like install constraints were changed.

Sorry for the confusion. I've added a conftest.py file that prevents the UnparsedFlagAccessError from being raised during pytest execution, and I've updated the PR title to reflect this change.

[peytondmurray]

This deletes the pytest Config object - how come this is needed here? Won't this destroy all pytest and pytest plugin configuration?

[nikelite]

I initially thought the config object was only used within the function, but to prevent potential issues, I've removed it. Thanks!