Description of problem:
Missing flash message after Middleware "Add Datasource" operation and the wizard form is not being reset after adding/canceling it.
Steps to Reproduce:
1. Add a new Datasource to a Middleware server
2. On completion, the wizard will close and no feedback message is shown to the user, while a flash message should be shown with the success/failure of the operation
3. Additionally, if the wizard is openend again, it will contain previous usage information, it should be cleared.
Pull Request @ https://github.com/ManageIQ/manageiq/pull/12820
Verified on 126.96.36.199
After adding the data source, below message is shown in UI:
'Datasource "H2DS-Test" installation has started on this server.'
UI also shows success message for the operation - 'The operation Add Datasource H2DS-Test on Local (04d08a42-f136-4711-8ed4-f524d38b6213) completed successfully.'
Verified that if the add datasource wizard is opened again, the wizard starts clear with 'Choose Datasource' step and does does not display any previous usage information.