BTHLABS-56: _Copy share link_ button in view association page

Co-authored-by: Tomek Wójcik <labs@tomekwojcik.pl>
Co-committed-by: Tomek Wójcik <labs@tomekwojcik.pl>

services/backend/tests/ui/views/associations/test_view.py

@@ -27,6 +27,14 @@ def test_authenticated_ok(authenticated_client: Client,
     assert hasattr(result.context['association'], 'target') is True
     assert result.context['association'].target.pk == association_out.target.pk
     assert result.context['show_controls'] is True
+    assert 'share_url' in result.context
+
+    expected_share_url = reverse(
+        'ui.associations.view',
+        args=(association_out.pk,),
+        query=[('share', 'true')],
+    )
+    assert result.context['share_url'] == expected_share_url
 
 
 @pytest.mark.django_db