[epic] Port relevant Extension reconciler logic over to ClusterExtension

[joelanford]

We have been working a lot on fine tuning the logic of the Extension controller recently. The major themes have been:

• Make the updates of various status fields more orthogonal
  • resolution results
  • prorgressing state
  • status of the currently installed bundle
  • deprecation status of the currently installed bundle and the specified package and channel
• Removal of deppy due to the lack of a need for a SAT solver.
• Make room in the ClusterExtension API for other techniques for sourcing bundles (i.e. enable a future where bundles don't have to be sourced from a catalog)

Once we wrap that work up, let's port the relevant bits over to the ClusterExtension controller.

[m1kola]

Deppy removal PR: #758

[gallettilance]

Extension API fields in ClusterExtension API #842

[ankitathomas]

#846 includes the status field updates

[ankitathomas]

Closing this out, follow-up work for sourcing bundles from non-catalog sources tracked in #906: epic #903