Surface deck errors as Kubernetes events

[czeslavo]

Is there an existing issue for this?

• I have searched the existing issues

Problem Statement

Similarly to #3205, we'd like to make sure that all error/warnings detected by deck when applying configuration in DB-mode are properly propagated by means of Kubernetes events.

Proposed Solution

Refactor deck sync.Solver so it returns errors/warnings it detected.

Additional information

No response

Acceptance Criteria

• When deck rejects an entity a Kubernetes Event is created on the resource that is the reason for rejection.

[mheap]

This is a nice to have, but given our primary topologies of DB-less and non-KIC with Konnect I think this should wait

[mflendrich]

It may make sense to do #5289 as a prerequisite for this issue.