[Feature Request] Obtain list of consumers for content packs

[Scarlett Gately Moore]

I don't know if this is the correct approach. But here is the problem:

We release new content packs often. We do security updates often. kde-neon extension is often behind in versions ( another issue entirely to be addressed there. ) So we end up with snaps with dangling content snap versions when we clean up old content snaps ( Our current setup does not allow for us to maintain many versions, and I don't really want to have to maintain many versions.

By dangling I mean:

warning: |
  snap "kde-frameworks-5-102-qt-5-15-8-core22" has bad plugs or slots:
  kde-frameworks-5-102-0+p22-qt-5-15-core22 (invalid slot name:
  "kde-frameworks-5-102-0+p22-qt-5-15-core22")

This is an old content snap I removed due to security issues. We have no way to tell what snap failed so I can rebuild with new content pack or inform the application developer that it needs to be rebuilt.

Thoughts?