Reorganizing Test Structure

[rodrigobr-msft]

This pull request updates the Python dependency management and refines the test utilities structure. The main changes are the introduction of a new dev_dependencies.txt file for development dependencies, updates to CI/CD workflows to use this file, and the reorganization of test utility imports and file locations for better maintainability.

Dependency management improvements:

• Added a new dev_dependencies.txt file listing development dependencies such as pytest, pytest-asyncio, and pytest-mock, and updated CI/CD scripts to install dependencies from this file instead of requirements.txt. (.azdo/ci-pr.yaml [1] .github/workflows/python-package.yml [2] dev_dependencies.txt [3]

Test utilities reorganization:

• Renamed and updated import paths in test utility files to use the new tests/_common/storage/utils.py, improving clarity and maintainability of the test codebase. (tests/_common/storage/utils.py tests/_common/storage/utils.pyL7-R12)
• Updated import statements in activity test files to reflect new directory structure and file locations, ensuring consistency and reducing confusion. (tests/activity/test_activity.py [1] tests/activity/test_tools.py [2]