Merge pull request #52030 from soltysh/creationtimestamp_audit

Automatic merge from submit-queue (batch tested with PRs 51900, 51782, 52030)

Fill in creationtimestamp in audit events

**What this PR does / why we need it**:
This is fixing null creationtimestamp in audit events.

@sttts @crassirostris like we've talked earlier today

**Release note**:
```release-note
none
```

Kubernetes-commit: 36b3a0d75b177f7fb3b68750b46dd4c2aeb45664

pkg/endpoints/filters/audit.go

@@ -23,6 +23,7 @@ import (
 	"net"
 	"net/http"
 	"sync"
+	"time"
 
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
@@ -147,6 +148,7 @@ func processAuditEvent(sink audit.Sink, ev *auditinternal.Event, omitStages []au
 			return
 		}
 	}
+	ev.CreationTimestamp = metav1.NewTime(time.Now())
 	audit.ObserveEvent()
 	sink.ProcessEvents(ev)
 }