pkg/cvo/sync_worker: Drop "Manifest: ..." logging

This line is descended from logging we grew way back in 847f71b
(pkg/cvo: update to new updatepayload structure, 2018-09-18, openshift#14).
But we triggered it recently with 88c222c
(install/0000_00_cluster-version-operator_03_deployment: Bump to
--v=5, 2020-08-30, openshift#448).  Drop the line, because it's noisy spew in
the log files, and we can get the manifest content via:

  $ oc adm release extract --to=manifests $PULLSPEC

pkg/cvo/sync_worker.go

@@ -699,7 +699,6 @@ func (w *SyncWorker) apply(ctx context.Context, payloadUpdate *payload.Update, w
 			cr.Update()
 
 			klog.V(4).Infof("Running sync for %s", task)
-			klog.V(5).Infof("Manifest: %s", string(task.Manifest.Raw))
 
 			ov, ok := getOverrideForManifest(work.Overrides, task.Manifest)
 			if ok && ov.Unmanaged {