To avoid confusion between custom and payload repositories.
Custom repositories will be embedded in the yum config, payload
repositories are used for installing packages.
All instances of '3rd party repositories' (and its variations) have been
changed to 'Custom repositories'. This is in better agreement with the
content sources app on consoledot, which generally is called either
'Custom Repositories' or 'Repositories'. Additionally, it is possible to
add and manage Red Hat repositories via content sources, which makes
'3rd party' confusing.
Adds support for 3rd party repositories using the Red Hat Insights
Repositories app on console.redhat.com.
The packages step has been refactored heavily to reduce the bug surface
area and improve its reusability (it is now used in two Wizard steps).
New features related to the Repositories app are currently only exposed
in stage. Because stage and production are quite divergent (they have
different steps, for instance) there are separate test suites for the
production and stage versions of the Wizard. When these features are
moved into production, the two test suites can be merged into one.
