Return to pool functionality in Administer Workflow

[AndrewAlesik]

References

• This pull request related to DSpace/dspace-angular/pull/3054

Description

This changes provided for make possible to find claimed task by workflow item for eperson with admin rights.

Instructions for Reviewers

Changes:

• First, modified REST endpoint for checking eperson for administer rights while looking for claimed task.
• Second, provided new function to find claimed task by workflow item.

Checklist

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• [X] My PR passes Checkstyle validation based on the Code Style Guide.
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• [ ] If my PR modifies REST API endpoints, I've opened a separate REST Contract PR related to this change.
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