feat(perf-issues): Tag new performance group creation metrics with group type (#43109)

Closes PERF-1907. Now that there's going to be more than one group, we
want to be able to filter by group type when we look at metrics.

src/sentry/event_manager.py

@@ -2338,10 +2338,13 @@ def _save_aggregate_performance(jobs: Sequence[PerformanceJob], projects: Projec
                         tags={"platform": event.platform or "unknown"},
                         sample_rate=1.0,
                     ) as metric_tags, transaction.atomic():
+                        problem = performance_problems_by_hash[new_grouphash]
+
                         span.set_tag("create_group_transaction.outcome", "no_group")
+                        span.set_tag("group_type", problem.type.name)
                         metric_tags["create_group_transaction.outcome"] = "no_group"
+                        metric_tags["group_type"] = problem.type.name
 
-                        problem = performance_problems_by_hash[new_grouphash]
                         group_kwargs = kwargs.copy()
                         group_kwargs["type"] = problem.type.value