do not create service binding io secret for key bindings

[danail-branekov]

We are currently creating a service binding io secret for bindings of type key. For such bindings we do not create servicebindingio binding, therefore this secret is not used. We should therefore:

• not create the secret
• do not set the CFServiceBinding.Status.Binding.Name field
• Verify usages of CFServiceBinding.Status.Binding.Name (probaly none, as this is the sbio "ducktype" and should be not referenced by Korifi code at all) - would an empty value be an issue?