Error Info from HTTPOperationError not returning without --debug flag

- If the issue is to do with Azure CLI 2.0 in-particular, create an issue here at [Azure/azure-cli](https://github.com/Azure/azure-cli/issues)

### Extension name (the extension in question)

k8sconfiguration

### Description of issue (in as much detail as possible)

- Error messages that are returned from our RP endpoint are not being propagated back to the user without using the --debug flag. Error that's returned is:
```
UnknownError: Operator returned an invalid status code 'Bad Request'
```

If you have access to the subscription, you can reproduce this error by performing the following commands
```
az account set --subscription 37524548-5887-4df0-a359-38a687fdb3bc
az k8sconfiguration create -n https-auth-config -g joinnis-test --cluster-name joinnis-arc-eus --cluster-type connectedClusters --scope cluster --operator-namespace config5 --operator-instance-name config5
```
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