Add InstallPlan Finalizers to OLM

[tmshort]

Feature Request

Is your feature request related to a problem? Please describe.

See #3108 and corresponding discussion:
https://kubernetes.slack.com/archives/C0181L6JYQ2/p1704293361617039

With various performance improvements, the test case in #3108 started to fail more frequently, as the Subscription would re-create the CSV faster, subsequently blocking the CR/CRBs from being deleted, and thus causing the test to fail.

However, finalizers are not used (in general) for cleanup, and should be added.

Describe the solution you'd like
Add finalizers for appropriate deletion actions.

InstallPlan Finalizer
In another case, it is possible to put a Subscription into a non-functional state if an InstallPlan is deleted too quickly:

1. Create Subscription with Manual Approval
2. Delete the resulting InstallPlan as quickly as possible
3. Wait for a new InstallPlan to be created

Often times step 3 will not occur, which results in the creation manual approval e2e test flaking.

Other finalizers may also be necessary, but we want to ensure these are resolved.

Copied from #3143