feat(llm-detector): New group category for LLM Detected Issues (#103089)

LLM detected issues will be from a variety of different categories so
there's no easy way to categorize them with the existing categories-
making a new category to support them

fixes
https://linear.app/getsentry/issue/ID-1083/add-new-issue-category-for-llm-detected-issues

Author: roggenkemper

src/sentry/issues/grouptype.py

@@ -66,6 +66,8 @@ class GroupCategory(IntEnum):
     FRONTEND = 14
     MOBILE = 15
 
+    AI_DETECTED = 16
+
 
 GROUP_CATEGORIES_CUSTOM_EMAIL = (
     GroupCategory.ERROR,
@@ -622,8 +624,8 @@ class LLMDetectedExperimentalGroupType(GroupType):
     type_id = 3501
     slug = "llm_detected_experimental"
     description = "LLM Detected Issue"
-    category = GroupCategory.PERFORMANCE.value
-    category_v2 = GroupCategory.METRIC.value
+    category = GroupCategory.AI_DETECTED.value
+    category_v2 = GroupCategory.AI_DETECTED.value
     default_priority = PriorityLevel.MEDIUM
     released = False
     enable_auto_resolve = False