fix(db): Avoid project db query by accessing just its id (#104008)

The attribute access in `group.project.id` results in unnecessary db
query and since we need only project id which is already present on the
Group model we can just access it directly.

Author: beezz

src/sentry/event_manager.py

@@ -1918,7 +1918,7 @@ def _process_existing_aggregate(
     # We pass `times_seen` separately from all of the other columns so that `buffer_inr` knows to
     # increment rather than overwrite the existing value
     times_seen = 1
-    if group.project.id in options.get("issues.client_error_sampling.project_allowlist"):
+    if group.project_id in options.get("issues.client_error_sampling.project_allowlist"):
         times_seen = _get_error_weighted_times_seen(event)
 
     buffer_incr(Group, {"times_seen": times_seen}, {"id": group.id}, updated_group_values)