Add configurable channel queue_size for audit/logger webhook targets (#13819)

Also log all the missed events and logs instead of silently
swallowing the events.

Bonus: Extend the logger webhook to support mTLS
similar to audit webhook target.

internal/logger/logger.go

@@ -374,7 +374,10 @@ func logIf(ctx context.Context, err error, errKind ...interface{}) {
 
 	// Iterate over all logger targets to send the log entry
 	for _, t := range Targets() {
-		t.Send(entry, entry.LogKind)
+		if err := t.Send(entry, entry.LogKind); err != nil {
+			LogAlwaysIf(context.Background(), fmt.Errorf("event(%v) was not sent to Logger target (%v): %v", entry, t, err), entry.LogKind)
+		}
+
 	}
 }