private boolean isInvalidDefaultStorageClass(List<String> defaultStorageClass) {
	    if (defaultStorageClass == null || defaultStorageClass.isEmpty() || defaultStorageClass.size() > 1) {
	        return true;
	    }
        return false;
    }
Validate Storage class
Checks for the following conditions in the cluster and fails when
<ol>
<li>There are no storage classes</li>
<li>No storage class is defined & default storage class does not exist in the cluster</li>
<li>Provided storage class does not exist in cluster</li>
</ol>

@param volumeList
workflow-controller/controller-service/src/main/java/io/hyscale/controller/validator/impl/VolumeValidator.java