chore(assignment): Add analytics when autoassigning after a manual assignment (#45099)

Add an analytics event when a user has already manually assigned an
issue and we then auto-assign it.

See [WOR-2320](https://getsentry.atlassian.net/browse/WOR-2320) for more
in depth explanation.

[WOR-2320]:
https://getsentry.atlassian.net/browse/WOR-2320?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

Author: ceorourke

src/sentry/models/projectownership.py

@@ -7,10 +7,11 @@
 from sentry import features
 from sentry.db.models import Model, region_silo_only_model, sane_repr
 from sentry.db.models.fields import FlexibleForeignKey, JSONField
-from sentry.models import ActorTuple
+from sentry.models import Activity, ActorTuple
 from sentry.models.groupowner import OwnerRuleType
 from sentry.models.project import Project
 from sentry.ownership.grammar import Rule, load_schema, resolve_actors
+from sentry.types.activity import ActivityType
 from sentry.utils import metrics
 from sentry.utils.cache import cache
 
@@ -287,6 +288,19 @@ def handle_auto_assignment(cls, project_id, event):
                 }
             )
 
+            activity = Activity.objects.filter(
+                group=event.group, type=ActivityType.ASSIGNED.value
+            ).order_by("-datetime")
+            if activity:
+                auto_assigned = activity[0].data.get("integration")
+                if not auto_assigned:
+                    analytics.record(
+                        "autoassignment.post_manual_assignment",
+                        organization_id=event.group.project.organization_id,
+                        project_id=project_id,
+                        group_id=event.group.id,
+                    )
+
             assignment = GroupAssignee.objects.assign(
                 event.group,
                 owner,