test: add unit tests for HardwareActions.unlock

[Dor-bl]

🎯 What: Added unit test coverage for HardwareActions.unlock across both Android and iOS drivers.
📊 Coverage: Tested unlock() behavior when mobile: isLocked returns True (verifying mobile: unlock is invoked) vs False (verifying early return without executing mobile: unlock).
✨ Result: Reached 100% statement coverage for HardwareActions.unlock in appium/webdriver/extensions/hw_actions.py.

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PR created automatically by Jules for task 6019952125829894588 started by @Dor-bl

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