`kubectl-kruise rollout approve` cannot support for v1beta1 rollout resource

[cywang1905]

Problem:
I installs the latest version of rollout(v0.5.0) and kubectl-kruise(v1.1).

When I use ctl to approve the rollout resource to the next step, which version is v1beta1, I got an errors as below:

It seems like ctl don't support v1beta1 rollout resource.

[karl-chanel]

I encountered the same problem.

[hantmac]

Hi @karl-chanel , @cywang1905 this pr will fix this problem, it is because the version of rollout in kubeclt-krise is v1alpha and it need to upgrade to v1beata1