[GA Blocker] Missing timestamps in operator, register-server, and attestation-key-register logs

[yalzhang]

Components affected:

• confidential-cluster-operator
• register-server
• attestation-key-register

Additional improvements: Consider migration to tracing framework for better observability

Current log example:

$ oc logs deployment.apps/confidential-cluster-operator
......
[INFO  operator::trustee] Recomputed reference values
[INFO  operator] reconciled (ObjectRef { dyntype: (), name: "compute-pcrs-ac9474f68f-quay-io-trusted-execution-clusters-fedo", namespace: Some("confidential-clusters"), extra: Extra { resource_version: Some("24574268"), uid: Some("ced82939-e1fe-40a0-98d4-3bc0463e66fc") } }, Action { requeue_after: None })