Undeleted succeeded workflows succeed all future operations

[jmendesky]

The operator's logic for determining whether an operation has succeeded is as follows:

If there is a pending workflow for the resource, then the operation is pending
or else, if there is a succeeded workflow for the resource, then the operation has succeeded
or else, if there is a failed workflow for the resource, then the operation has failed
or else the operation has failed.

This relies on the operator always deleting workflows once processed. In debug mode, however, these workflows are not deleted. In the case that the latest workflow has failed but previous workflows have succeeded, the operator will falsely mark the operation as succeeded.

This behaviour should be changed by marking all processed workflows so that they are filtered out for future operations.