interface: improve ClusterStagedUpdateRun APIs

[jwtty]

Description of your changes

1. Add additionalPrinterColumns for clusterStagedUpdateRun and clusterApprovalRequest objects.
2. Add validations in updateRun name length and stageName to ensure ApprovalRequest name valid .
3. Update the examples to use the v1beta1 APIs.

The get command outputs now look like:

kubectl get clusterstagedupdaterun
NAME          PLACEMENT           RESOURCE-SNAPSHOT               POLICY-SNAPSHOT        INITIALIZED   SUCCEEDED   AGE
example-run   example-placement   example-placement-0-snapshot   example-placement-7   True          True        13m

kubectl get clsuterstagedupdaterun -owide
NAME          PLACEMENT           RESOURCE-SNAPSHOT               STRATEGY           POLICY-SNAPSHOT        INITIALIZED   SUCCEEDED   AGE
example-run   example-placement   example-placement-0-snapshot   example-strategy   example-placement-7   True          True        3m47s

kubectl get clusterapprovalrequests
NAME                     UPDATE-RUN     STAGE        APPROVED   AGE
example-run-canary       example-run   canary       True       12m
example-run-production   example-run   production   True       11m

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