Fix: Determine workflow configuration by checking group assignment

[kskaiser]

References

• Fixes [Request a Correction] isWorkflowConfigured method does not work on migrated (<7.x) groups #534

Description

XMLWorkflowItemService#isWorkflowConfigured uses a pattern-based approach for identifying potential groups by name that would allow to edit/review an item. This does not work for migrated configurations <7.x; they use a different pattern. Furthermore, the existence of a group with a matching name says nothing about whether a workflow is actually configured for the collection.

Instructions for Reviewers

List of changes in this PR:

• First, the implementation was changed to get check for each possible workflow step of a collection a group is defined. If a group is defined and it's not empty, the check returns true.
• Second, the methods definition in the interface was changed, because the new implementation does not throw an exception.
• Third, a new integration test was implemented testing all possible configurations.
  The new test is XmlWorkflowItemServiceIT. Run it:

mvn install -DskipIntegrationTests=false  -DfailIfNoTests=false -Dit.test=XmlWorkflowItemServiceIT

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