Move test_interfaces out of geoips/commandline and into tests directory

[mindyls]

Requested Update

Description

• Since this uses pytest utilities, it should not be included in the main geoips code base. This will require updating the "code_checks.sh" script as well to call test_interfaces directory, rather than the console script. Also will need to be removed from pyproject.toml.

This entire script may be a duplicate of various pytests, so could potentially eventually be removed if we confirm 100% of the things tested in test_interfaces are tested via pytests.

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[evrose54]

See issue #496, which discusses where, when, and how we should validate the plugin registries. In PR #442, we moved the Pytest functionality attached to plugin_registry.py to geoips/tests/unit_tests/plugin_registries/test_plugin_registries.py. Therefore, test_interfaces.py shouldn't actually include any Pytest references. Rather, it's still using plg_reg.validate_all_registries and plg_reg.validate_registry, which are the functions that were moved to the unit tests. In my opinion, we should just remove those portions of test_interfaces.py, and reconsider where and when we'd like to validate the plugin registries. test_interfaces.py is failing because of those previous calls I mentioned.

[evrose54]

See #527.