Upgrade to Django 5.2 LTS (#16185)

Upgrade to Django 5.2 LTS with compatibility fixes across fields, migrations, dispatch config, tests, and dev deps.

Dependencies:
- Upgrade django to 5.2.8 and relax requirements.in to >=5.2,<5.3.
- Bump django-debug-toolbar to >=6.0 for compatibility.

Backend:
- awx/conf/fields.py: switch URL TLD regex to use DomainNameValidator.ul in custom URLField.
- awx/main/management/commands/gather_analytics.py: use datetime.timezone.utc for naïve datetime handling.
- awx/main/dispatch/config.py: add mock_publish option; avoid DB access for test runs, set default max_workers, and support a noop broker.

Migrations (SQLite/Postgres compatibility):
- Add awx/main/migrations/_sqlite_helper.py with db-aware AlterIndexTogether/RenameIndex wrappers; consume in 0144_event_partitions.py and 0184_django_indexes.py.
- Update 0187_hop_nodes.py to use CheckConstraint(condition=...).
- Add 0205_alter_instance_peers_alter_job_hosts_and_more.py adjusting through_fields/relations on instance.peers, job.hosts, and role.ancestors.
- _dab_rbac.py: iterate roles with chunk_size=1000 for migration performance.

Tests:
Include hcp_terraform in default credential types in test_credential.py.
---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Alan Rominger <arominge@redhat.com>

awx/main/dispatch/config.py

@@ -11,13 +11,22 @@ def get_dispatcherd_config(for_service: bool = False, mock_publish: bool = False
     Parameters:
     for_service: if True, include dynamic options needed for running the dispatcher service
       this will require database access, you should delay evaluation until after app setup
+    mock_publish: if True, use mock values that don't require database access
+      this is used during tests to avoid database queries during app initialization
     """
+    # When mock_publish=True (e.g., during tests), use a default value to avoid
+    # database access in get_auto_max_workers() which queries settings.IS_K8S
+    if mock_publish:
+        max_workers = 20  # Reasonable default for tests
+    else:
+        max_workers = get_auto_max_workers()
+
     config = {
         "version": 2,
         "service": {
             "pool_kwargs": {
                 "min_workers": settings.JOB_EVENT_WORKERS,
-                "max_workers": get_auto_max_workers(),
+                "max_workers": max_workers,
             },
             "main_kwargs": {"node_id": settings.CLUSTER_HOST_ID},
             "process_manager_cls": "ForkServerManager",