Refactor tests

[shatakshiiii]

ISSUE TYPE

• Tests refactoring

SUMMARY

• Refactor the common subdirectory inside tests/fixtures: https://github.com/ansible/ansible-creator/tree/main/tests/fixtures/common
• Align the directory structure of tests/fixtures/common with src/ansible-creator/resources/common
• Refactor test_add.py (remove # pylint: disable=C0302) - common code should not be re-written in multiple functions.