Tests modules overwrites local tests

[teika-dave]

When importing the python module looker_sdk, the tests module is also built, which overrides the local tests directory, which forces a directory rename, and thus a refactor of all testing code that uses it.

looker_sdk version is 22.18.0, installed with pip

[antonio-antuan]

bump

[otosky]

@jeremytchang @christelilaka

can #1416 be merged to address this? this crops up for installs of Apache Airflow that pull in the google-related extras.