Uninstall should handle db2u #1909
Description
Feature and motivation
When uninstalling a MAS instance:
- Look for, and offer to delete, any db2ucluster instances associated to the instance (which can be determined by their name)
- Also offer to delete the Db2u operator and namespace if there are no other db2ucluster instances in the db2u namespace
Usage example
When uninstalling a MAS instance the user may want to remove Db2uClusters associated with the instance.