Fix URL handling for global usage list

Also add integration tests to make sure URL generation works OK

Bug: 63908
Bug: 64910
Bug: 66147
Mingle: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/570
Change-Id: I448f42e294102a633f74c305dd0a226e7dbe955d
Merge "Fix URL handling for global usage list"