Add undo action for the argo rollouts custom resource actions

[skashrafbasha]

Summary

Add undo action for the argo rollouts custom resource actions

Motivation

This will be used to enable rollback button in rollout-extension to fix this issue

Proposal

Add undo action for the argo rollouts custom resource actions

• This is dependent on the solution implemented for this proposal in argo-rollouts here
• There is no built-in action to undo a particular revision and needs to be added as per the resource_actions docs here
• A new undo action is required, which modifies the rollout resource with status.undo.revision with the rollback revision number.
• Upon setting the rollout status.undo.revision, the rollout controller reconciliation will act as per the undo action and remove the status.undo.revision.