chore(ACI): Clean up metric issue (#103569)

Remove the no longer used metric issue poc, some text indicating that
metric issue is still wip (it is not), and update the config description
to be accurate.

Author: ceorourke

src/sentry/incidents/grouptype.py

@@ -318,8 +318,6 @@ def construct_title(
         )
 
 
-# Example GroupType and detector handler for metric alerts. We don't create these issues yet, but we'll use something
-# like these when we're sending issues as alerts
 @dataclass(frozen=True)
 class MetricIssue(GroupType):
     type_id = 8001
@@ -339,7 +337,7 @@ class MetricIssue(GroupType):
         validator=MetricIssueDetectorValidator,
         config_schema={
             "$schema": "https://json-schema.org/draft/2020-12/schema",
-            "description": "A representation of a metric alert firing",
+            "description": "A representation of a metric detector config dict",
             "type": "object",
             "required": ["detection_type"],
             "properties": {

src/sentry/issues/grouptype.py

@@ -672,20 +672,6 @@ class FeedbackGroup(GroupType):
     enable_escalation_detection = False
 
 
-@dataclass(frozen=True)
-class MetricIssuePOC(GroupType):
-    # DEPRECATED, use metric_issue (8001) instead
-    type_id = 8002
-    slug = "metric_issue_poc"
-    description = "DEPRECATED Metric Issue POC"
-    category = GroupCategory.METRIC_ALERT.value
-    category_v2 = GroupCategory.METRIC.value
-    default_priority = PriorityLevel.HIGH
-    enable_auto_resolve = False
-    enable_escalation_detection = False
-    enable_status_change_workflow_notifications = False
-
-
 @dataclass(frozen=True)
 class WebVitalsGroup(GroupType):  # TODO: Rename to WebVitalsGroupType
     type_id = 10001