Warm the settings cache before measuring bulk host create queries (#16741)

test_bulk_host_create_num_queries budgets 15 queries per request. The
first request in a pytest process pays one extra query for each
database-backed setting it reads (PROXY_IP_ALLOWED_LIST,
REMOTE_HOST_HEADERS, BULK_HOST_MAX_CREATE) until the settings
wrapper's in-memory cache is warm, so the budget only held when an
earlier test in the same xdist worker had already warmed it. Make one
untimed request first so the assertion measures steady state.

awx/main/tests/functional/test_bulk.py

@@ -35,6 +35,12 @@ def test_bulk_host_create_num_queries(organization, inventory, post, get, user,
     organization.inventory_admin_role.members.add(org_inv_admin)
     inventory.admin_role.members.add(inventory_admin)
 
+    # The first request in a process pays one query per database-backed
+    # setting it reads; later ones hit the settings wrapper's in-memory
+    # cache. Warm it so the budget below measures steady state regardless
+    # of which test ran first in this xdist worker.
+    post(reverse('api:bulk_host_create'), {'inventory': inventory.id, 'hosts': [{'name': uuid4()}]}, superuser, expect=201)
+
     for u in [org_admin, inventory_admin, org_inv_admin, superuser]:
         hosts = [{'name': uuid4()} for i in range(num_hosts)]
         with django_assert_max_num_queries(num_queries):