Leader Election doesn't properly report OnError

[andradf]

Describe the bug
Leader election should report any errors in trying to acquire a lock on a lease, not only when the response code is NotFound. A specific case where an error should be reported would be when the service account doesn't have permissions to create/update a lease.

Kubernetes C# SDK Client Version
15.0.1

Dotnet Runtime Version
net8

To Reproduce
Use the LeaderElector class in a pod running without permissions on coordination.k8s.io/leases.

Expected behavior
One would expect RunUntilLeadershipLostAsync to trigger an OnError invocation when the k8s api returns 403.