This commit adds a new step 'Users' that is enabled only in stage-preview,
and will enable it in stage-stable once IQE tests are ready.
The step is not functional yet, this is just the first step.
This add tests to check whether the Review and finish button works properly, sending user to the Details step. And whether it's disabled when the state is invalid.
This adds tests to check that the revisit buttons on the Review step are working correctly.
Also some minor cleanup, namely making case used in the names of describe and test more consistent and moving render functions outside of functions selecting targets to make the structure easier to go through.
This moves `selectCustomRepo` to `wizardTestUtils.tsx`
Since the function was originally imported into `Packages.test.tsx` from `CreateImageWizard.content.test.tsx` the entire content suite was re-run under Packages suite each time. This solves the issue.
