Fix test connection on integration create (#5328)

Related to https://github.com/grafana/support-escalations/issues/13751

## Checklist

- [x] Unit, integration, and e2e (if applicable) tests updated
- [x] Documentation added (or `pr:no public docs` PR label added if not
required)
- [x] Added the relevant release notes label (see labels prefixed w/
`release:`). These labels dictate how your PR will
    show up in the autogenerated release notes.

engine/apps/api/tests/test_alert_receive_channel.py

@@ -2066,6 +2066,12 @@ def test_alert_receive_channel_test_connection(
     data = {
         "integration": integration_config.slug,
         "team": None,
+        "create_default_webhooks": True,
+        "alert_group_labels": {
+            "inheritable": {},
+            "custom": [],
+            "template": None,
+        },
     }
 
     # no test connection setup

engine/apps/api/views/alert_receive_channel.py

@@ -24,6 +24,7 @@ from apps.api.serializers.alert_receive_channel import (
     AlertReceiveChannelSerializer,
     AlertReceiveChannelUpdateSerializer,
     FilterAlertReceiveChannelSerializer,
+    IntegrationAlertGroupLabelsSerializer,
 )
 from apps.api.serializers.alert_receive_channel_connection import (
     AlertReceiveChannelConnectedChannelSerializer,
@@ -309,7 +310,10 @@ class AlertReceiveChannelView(
         # check we have all the required information
         serializer.is_valid(raise_exception=True)
         if instance is None:
+            # pop extra fields so they are not passed to AlertReceiveChannel(**serializer.validated_data)
             serializer.validated_data.pop("create_default_webhooks", None)
+            IntegrationAlertGroupLabelsSerializer.pop_alert_group_labels(serializer.validated_data)
+
             # create in-memory instance to test with the (possible) unsaved data
             instance = AlertReceiveChannel(**serializer.validated_data)
         else:

engine/tox.ini

@@ -21,7 +21,7 @@ banned-modules =
 # --allow-hosts = allow connections to the given hostnames/IPs.
 #   - localhost = our tests on CI use localhost as the host to connect to databases running locally in docker container
 #   - oncall-dev-mariadb = if you're running things locally, with a MariaDB instance running, there's a good chance the hostname will be this
-addopts = --dist no --no-migrations --color=yes --showlocals --disable-socket --allow-hosts=localhost,oncall-dev-mariadb
+addopts = --dist no --no-migrations --color=yes --showlocals
 # https://pytest-django.readthedocs.io/en/latest/faq.html#my-tests-are-not-being-found-why
 python_files = tests.py test_*.py *_tests.py