test: Update flutter tests to canonic pytest format #605

Job	Run time
ios_test (test/functional/ios/safari_tests.py, func_test_ios1)	13m 13s
flutter_e2e_test (macos-15, flutter-ios)	13m 38s
android_test (test/functional/android/appium_service_tests.py test/functional/android/chrome_test...	3m 19s
flutter_e2e_test (ubuntu-latest, flutter-android)	6m 59s
	37m 9s

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