Fix deadlock caused by apiserver outage during init

[brandond]

We had similar code to prevent blocking when calling Update(), but not in the init function.

dynamiclistener/storage/kubernetes/controller.go

Lines 200 to 204 in e6585da

	func (s *storage) Update(secret *v1.Secret) error {
	// Asynchronously update the Kubernetes secret, as doing so inline may block the listener from
	// accepting new connections if the apiserver becomes unavailable after the Secrets controller
	// has been initialized. We're not passing around any contexts here, nor does the controller
	// accept any, so there's no good way to soft-fail with a reasonable timeout.

Ref: rancher/rancher#42278