Update test_assistants.py

[AranavMahalpure]

Added Type Annotations: Type hints were added to the function signatures to improve code readability and enable static type checking (e.g., mock_get_client(monkeypatch) -> None). Enhanced Comments:

Detailed comments were added to explain the purpose and context of each function and test. This helps future developers understand the code and the intent behind certain decisions. Assertion Messages:

Custom messages were added to assertions (e.g., assert ai.id, "Expected the assistant to have an id after creation."). This makes it easier to debug when a test fails, as the message provides context. DRY Principle:

Repeated code for creating and deleting assistants in the TestLifeCycle class was refactored into a helper method called assert_lifecycle. This helps avoid redundancy and adheres to the Don't Repeat Yourself (DRY) principle. Improved Test Case Readability:

The tests were reorganized to improve readability, such as moving shared logic into helper methods and separating setup logic from assertions. Consistency in Test Names:

Test methods were renamed for better clarity (e.g., test_context_manager instead of a generic name). This makes it easier to identify what each test is verifying. These improvements help in maintaining the existing functionality while making the code more maintainable, readable, and easier to extend.

[zzstoatzz]

hi @AranavMahalpure - we use ruff for formatting, so manual re-formatting PRs will not be accepted

[AranavMahalpure]

Can you please provide your PR Format so that I can fill it.