refactor: mobile: getAppStrings to use execute_script exclusively #670

Job	Run time
ios_test (test/functional/ios/safari_tests.py, func_test_ios1)	19m 6s
android_test (test/functional/android/appium_service_tests.py test/functional/android/chrome_test...	4m 8s
flutter_e2e_test (ubuntu-latest, flutter-android)	5m 1s
flutter_e2e_test (macos-15, flutter-ios)	30m 18s
	58m 33s

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