test: add unit tests for hooks person_follow_hook module

[Wanbogang]

Summary

This PR adds comprehensive unit tests for the src/hooks/person_follow_hook.py module to improve code coverage and ensure the stability of the start_person_follow_hook and stop_person_follow_hook functions.

Changes

• Added tests/test_hooks_person_follow_hook.py with tests for:
  • start_person_follow_hook function (success on first attempt, success after retry, max retries exceeded, connection error)
  • stop_person_follow_hook function (success, failure, connection error)
• Properly mocks the aiohttp.ClientSession and related components for testing
• Includes helper functions to reduce code duplication in tests
• Uses pytest and unittest.mock for asynchronous mocking
• Implements efficient mocking strategy with helper functions

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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