[quick_actions] Remove manual thread hop in Android response

[stuartmorgan-g]

Method channel replies have been thread safe for quite a while, so the old code to hop back to the main thread to send a response is no longer needed.

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[flutter-dashboard]

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[stuartmorgan-g]

test-exempt: removing code

[gemini-code-assist]

Code Review

This pull request updates the quick_actions_android package to version 1.0.29. The changes simplify thread handling in QuickActions.java by removing the custom UiThreadExecutor and the explicit dispatch of results to the main thread within the setShortcutItems method. I have no feedback to provide.