🧹 refactor: remove legacy fallbacks for hw_actions extension

[Dor-bl]

🎯 What: The code health issue addressed
Removed the try-except fallback blocks and dependency on CanRememberExtensionPresence for legacy mobile commands in HardwareActions (lock, unlock, is_locked, shake, finger_print).

💡 Why: How this improves maintainability
The fallback logic (e.g. assert_extension_exists and UnknownMethodException) for handling legacy endpoints that are being deprecated adds unnecessary bloat and complexity. Executing scripts with the mobile: prefix is the standard Appium way. Removing the fallbacks simplifies the code by removing branching logic.

✅ Verification: How you confirmed the change is safe
Ran make unittest and verified that 173 tests pass. Updated lock_test.py, shake_test.py and fingerprint_test.py to use execute/sync mocks to verify the correct payload for the mobile scripts.

✨ Result: The improvement achieved
A significantly cleaner hw_actions.py module with direct and performant execution of mobile extensions, decreasing overall complexity.

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PR created automatically by Jules for task 10425047002999956329 started by @Dor-bl

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[Dor-bl]

Closing — no longer relevant against upstream (appium/python-client). Current upstream appium/webdriver/extensions/hw_actions.py already has zero UnknownMethodException/CanRememberExtensionPresence fallback logic — it already matches this PR's target state exactly. This was covered by upstream's legacy-fallback removal effort (#1267).

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