[bug] Version conflicts when updating the status.

[runkecheng]

Is your feature request related to a problem? Please describe.

operator log:

ERROR   syncer.StatusSyncer     failed to update cluster status {"mysqlcluster": "sample", "namespace": "default", "error": "Operation cannot be fulfilled on \"sample\": the object has been modified; please apply your changes to the latest version and try again"}

Describe the solution you'd like

Update () needs to compare ResourceVersion.
If the operator only updates the Status, it doesn’t need to pay attention to ResourceVersion
We can use Patch() to instead of Update().

	defer func() {
		if !reflect.DeepEqual(status, instance.Status) {
			sErr := r.Status().Update(ctx, instance.Unwrap())
			if sErr != nil {
				log.Error(sErr, "failed to update cluster status")
			}
		}
	}()

link: https://github.com/kubernetes-sigs/controller-runtime/blob/master/pkg/client/interfaces.go#L97

Describe alternatives you've considered

Additional context