fix: fixed new suggestions by copilot

[Kanchan-Microsoft]

Purpose

This pull request makes minor cleanups to the test codebase, mostly focused on import statements and class inheritance for async test cases. The changes improve code consistency and remove unused imports.

Test code consistency and cleanups:

• Replaced direct imports of IsolatedAsyncioTestCase with unittest.IsolatedAsyncioTestCase in several test classes to standardize async test case inheritance. [1] [2] [3] [4]
• Removed unused or redundant imports from multiple test files, including asyncio, unittest.mock, and typing-related imports. [1] [2] [3] [4] [5]
• Ensured that unittest.main() is called correctly in test_human_approval_manager.py without redundant imports.

Does this introduce a breaking change?

• Yes
• No

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install

• Test the code

What to Check

Verify that the following are valid

• ...

Other Information

[github-actions]

🎉 This PR is included in version 4.0.7 🎉

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