refactor: mobile: getAppStrings to use execute_script exclusively #669

Job	Run time
android_test (test/functional/android/appium_service_tests.py test/functional/android/chrome_test...	1m 23s
flutter_e2e_test (ubuntu-latest, flutter-android)	1m 24s
flutter_e2e_test (macos-15, flutter-ios)	1m 31s
ios_test (test/functional/ios/safari_tests.py, func_test_ios1)	6m 20s
	10m 38s

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