fix sync streams and add diffs for annotations and owner references (#2728)

* extend and improve hasSlotsInSync unit test
* fix sync streams and add diffs for annotations and owner references
* incl. current annotations as desired where we do not fully control them
* added one more unit test and fixed sub test names
* pass maintenance windows to function and update unit test

pkg/cluster/majorversionupgrade.go

@@ -73,7 +73,7 @@ func (c *Cluster) majorVersionUpgrade() error {
 		return nil
 	}
 
-	if !c.isInMainternanceWindow() {
+	if !isInMainternanceWindow(c.Spec.MaintenanceWindows) {
 		c.logger.Infof("skipping major version upgrade, not in maintenance window")
 		return nil
 	}