EPIC: UX Improvements to the Plugin Registry

[Skarlso]

Two user quality of life improvement features have been de-scoped from the original registry EPIC #374.

These are:

• OCM CLI: Output for downloaded plugins could display plugin type. open-component-model#517
• Registry configuration addition to configure registry locations #599

These two issues weren't required for the EPIC to be completed, but are still things that we should do eventually.

Hence they were removed from the EPIC.