telemetry(amazonq): AgenticChat cwsprChatConversationType #1012

## Problem
- new product requirements include determining `Chat` vs `AgenticChat`

## Solution
- added `AgenticChat` cwsprChatConversationType

Author: chungjac

telemetry/definitions/commonDefinitions.json

@@ -1020,7 +1020,8 @@
             "allowedValues": [
                 "Chat",
                 "Assign",
-                "Transform"
+                "Transform",
+                "AgenticChat"
             ],
             "description": "Identifies the type of conversation"
         },