telemetry(amazonq): unused metric and field #948

## Problem
`codeTransform_viewArtifact` and its
`codeTransformVCSViewerSrcComponents` field are unused.

## Solution
Remove them.

Author: dhasani23

telemetry/definitions/commonDefinitions.json

@@ -484,17 +484,6 @@
             "type": "string",
             "description": "A unique upload ID for S3"
         },
-        {
-            "name": "codeTransformVCSViewerSrcComponents",
-            "type": "string",
-            "description": "Names of components that can initiate the diff viewer",
-            "allowedValues": [
-                "chat",
-                "toastNotification",
-                "treeView",
-                "treeViewHeader"
-            ]
-        },
         {
             "name": "codewhispererAcceptedTokens",
             "type": "int",
@@ -4332,36 +4321,6 @@
                 }
             ]
         },
-        {
-            "name": "codeTransform_viewArtifact",
-            "description": "User clicks to view downloaded artifact.",
-            "metadata": [
-                {
-                    "type": "codeTransformArtifactType",
-                    "required": true
-                },
-                {
-                    "type": "codeTransformJobId",
-                    "required": true
-                },
-                {
-                    "type": "codeTransformSessionId",
-                    "required": true
-                },
-                {
-                    "type": "codeTransformStatus",
-                    "required": true
-                },
-                {
-                    "type": "codeTransformVCSViewerSrcComponents",
-                    "required": true
-                },
-                {
-                    "type": "userChoice",
-                    "required": false
-                }
-            ]
-        },
         {
             "name": "codewhisperer_blockedInvocation",
             "description": "Client side invocation blocked by another invocation in progress",