Wire up dynamic caching layer to manage installed content

[everettraven]

Following #974 , we need to wire up the ClusterExtension reconciler to utilize the dynamic cache for establishing watches on the resources to be managed for a particular ClusterExtension.

Acceptance Criteria:

• Utilize the dynamic cache implementation created in Implement a dynamic caching layer that establishes watches utilizing a ServiceAccount #974 for establishing watches on resources to be managed for a given ClusterExtension
• When ClusterExtensions are deleted, their managed content caches are stopped and removed
• Updates to unit+e2e tests as necessary
• Addition of an e2e test that validates a manual change to a managed resource is reconciled and reverted