Bug 32030: ERM - Add more API tests

Bug 32030: ERM - Add more API tests

- Agreements: Added tests for search and filter_expired as well as some missing comments; fix user flags
- Licenses: Updated tests to be on par with agreements; fix user flags
- EHoldings Packages: New tests on par with others
- EHoldings Titles: New tests on par with others plus import titles tests
- EHoldings Resources: New tests - get and list
- Documents: New tests; Only has GET endpoint; Tests to better mirror real documents lifecycle through a license;
- Users: New tests

Signed-off-by: Jonathan Field <jonathan.field@ptfs-europe.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>