Removing coming soon section from Package Registry UI
Context
The Package Registry code includes a section for coming soon features. This feature was added when we were still considering regularly adding new package manager formats. GitLab's priorities have shifted, we'd like to support additional formats such as Debian, RPM, and Rubygems, but not enough that we will need to advertise in the app.
Proposal
Remove this code from the codebase so it does not have to be maintained.