Outsource %ansible_test_unit logic to helper script

We want %ansible_test_unit to retrieve the collection name{,space} from
galaxy.yml. This removes the need for the %collection_name{,space}
macros and utilizes ansible_collection.py's more robust approach to
running the tests.

macros.ansible

@@ -13,12 +13,10 @@
 --filelist %{ansible_collection_filelist}
 }
 
+%ansible_test_unit() %{shrink:
+%{_rpmconfigdir}/ansible_collection.py test --
+--python-interpreter %{__python3} --local %{?*}
+}
 
-%ansible_test_unit() %{expand:\\\
-mkdir -p ../ansible_collections/%{collection_namespace}
-cp -a $(pwd) ../ansible_collections/%{collection_namespace}/%{collection_name}
-pushd ../ansible_collections/%{collection_namespace}/%{collection_name}
-ansible-test units --python-interpreter %{__python3} --local %{?*}
-popd}
 
 %ansible_collection_files %{_datadir}/ansible/collections/ansible_collections/%{collection_namespace}/