* reword button to Create a new data source
The previous wording included the name of the data source, which made it
difficult for the doc team to refer to it.
This allows the doc team to refer to this button in an obvious way.
* "Create a"-> "Add"
* update tests
* added missing permissions check
* moved the permission check to the datasource component.
* added test for checking permissions.
* added tests with different permissions.
* minor refactoring so the mockUserPermisson can be reused.
* added post installation steps.
* changes according to feedback.
* removing return union null type.
* added tests.
* changing the wording of the button to 'create a..'
* updated tests to check for the updated copy.
* changing the back to be a regular back button.
* updated snapshot
