feat: if no match for an email exists widen the search (#2821)

This is to work around the fact that users can have either @trade or @businessandtrade emails currently. We are at whim of the SSO service as to which one a user has. This change allows us to search for a @trade user but if no user is found, return an @businessandtrade user

dataworkspace/dataworkspace/apps/datasets/views.py

@@ -1711,21 +1711,18 @@ def get_context_data(self, **kwargs):
                 context["non_matches"] = non_email_matches
 
             else:
-                email_filter = Q(email__icontains=search_query.strip())
-                name_filter = Q(first_name__icontains=search_query.strip()) | Q(
-                    last_name__icontains=search_query.strip()
+                search_query = search_query.strip()
+                email_filter = Q(email__icontains=search_query)
+                name_filter = Q(first_name__icontains=search_query) | Q(
+                    last_name__icontains=search_query
                 )
                 users = get_user_model().objects.filter(Q(email_filter | name_filter))
+                if not users.exists() and len(search_query.split("@")) != 1:
+                    users = get_user_model().objects.filter(
+                        email__istartswith=search_query.split("@")[0]
+                    )
                 context["search_results"] = users
             context["search_query"] = search_query
-            try:
-                search_query = self.request.session.pop(
-                    f"search-query--edit-dataset-permissions--{self.obj.pk}--{self.summary.id}"
-                    if self.summary
-                    else f"search-query--edit-dataset-permissions--{self.obj.pk}"
-                )
-            except KeyError:
-                search_query = None
         context["obj"] = self.obj
         context["obj_edit_url"] = (
             reverse("datasets:edit_dataset", args=[self.obj.pk])