Test unify enh fixes

- Added assertion to check that the result of the put operation of moveField contains the updated destination node with the moved field
- Added assertion to check that the descendants api also contains the 2 nodes with their respective fields after the move operation
- Added another test to check that passing a non existing destination node id returns a 404 Not found instead of a 400 Bad Request
- Added another test to check that trying to move a field without enough authorization (trying to move a field to a node created by another user) results in a 403 Forbidden
- Added a test for the use case of moving a node to another activity with a member in the ACL