Namespace referenced for duplicate DSC and DSC Init Error Messages

[strangiato]

Describe the bug
When a second instance of the DSC or DSCInit is created it throws the following error in the operator pod:

only one instance of DataScienceCluster object is allowed. Update existing instance on namespace and name default2

The error is generated from the code here:

opendatahub-operator/controllers/datasciencecluster/datasciencecluster_controller.go

Line 81 in e1e558a

message := fmt.Sprintf("only one instance of DataScienceCluster object is allowed. Update existing instance on namespace %s and name %s", req.Namespace, req.Name)

Which referes to req.Namespace which is blank.

Since both objects are cluster scoped objects they won't ever report a namespace.

To Reproduce
Steps to reproduce the behavior:

1. Create a DSC
2. Create a DSC with a new name
3. View error log in operator pod

Expected behavior
The reference to namespace should probably be removed from the error message so the error message makes a little more sense.

I'm guessing that all of the references to req.Namespace can be removed from the object but not 100% sure if it is needed for some reason.

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Additional context
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