Revert to Fix AddConfigWidgetTest

- we were checking the widget being valid and bound after we are accepting the config
- solution is to revert back to test before and check post result after be check if widget is valid and bound.

making sure that ShellCommandRule is checking for success,
refactor for AddConfigWidgetTest with extra launcher wait condition.

Test: none
Bug: 276794291
Flag: not needed
Change-Id: I4a6caf0851a947da03711b2a5d5bc9f736a47f95