Update the test checking for cooperative kernels in conditional nodes.

[galv]

Now we conditionally xfail only when a cuda driver version less than 12.6 is installed. CUDA 12.6 fixes this issue. Before it, cooperative kernels could not be used within the body of a conditional node.

We also provide a better error message for users to know that the fix is to upgrade to CUDA 12.6.

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This PR was closed because it has been inactive for 7 days since being marked as stale.