[connectors-qa] Running pytest should not require DOCKER_HUB_USERNAME

[natikgadzhi]

Problem

I was trying to fix test failures in #37839 and running poetry run pytest tests in airbyte-ci/connectors/connectors_qa, but it wants DOCKER_HUB_USERNAME to be set to run some of the unit tests:

ERROR tests/integration_tests/test_documentation.py - ValueError: Environment variable DOCKER_HUB_USERNAME is required for this check
ERROR tests/unit_tests/test_checks/test_assets.py - ValueError: Environment variable DOCKER_HUB_USERNAME is required for this check
ERROR tests/unit_tests/test_checks/test_documentation.py - ValueError: Environment variable DOCKER_HUB_USERNAME is required for this check
ERROR tests/unit_tests/test_checks/test_metadata.py - ValueError: Environment variable DOCKER_HUB_USERNAME is required for this check
ERROR tests/unit_tests/test_checks/test_packaging.py - ValueError: Environment variable DOCKER_HUB_USERNAME is required for this check
ERROR tests/unit_tests/test_checks/test_security.py - ValueError: Environment variable DOCKER_HUB_USERNAME is required for this check
ERROR tests/unit_tests/test_models.py - ValueError: Environment variable DOCKER_HUB_USERNAME is required for this check

This doesn't sound right. Why do we need docker hub creds for a unit test of all things?

[natikgadzhi]

Oh lol. @alafanechere beat me to it and actually fixed this before I even opened this issue, in #37787. Thank you!