Handle `v1` storage conversion

See https://github.com/tektoncd/pipeline/issues/6382.

In a gist, the API storage version in tektoncd/pipeline version that will be ship with 1.11 is expected to change to v1. We need to make sure we properly handle this.

• Upgrading the operator doesn't end up with having both v1beta1 and v1 in storedVersions (as it happens for v1alpha1 to v1beta1)
• Make sure we upgrade object from v1beta1 to v1 (in storage) for this. (https://github.com/kubernetes-sigs/kube-storage-version-migrator or https://github.com/knative/pkg/tree/main/apiextensions/storageversion/cmd/migrate can be useful for this).