Add EG Blob Trigger templates (#4115)

* Add EG Blob Trigger templates for Node functions

* Remove non-4.x templates

resources/backupTemplates/nodejs-4.x/templates/templates.json

@@ -1452,6 +1452,54 @@
             "userPrompt": []
         }
     },
+    {
+        "id": "EventGridBlobTrigger-JavaScript-4.x",
+        "runtime": "2",
+        "files": {
+            "%functionName%.js": "const { app } = require('@azure/functions');\r\n\r\napp.storageBlob('%functionName%', {\r\n    path: '%path%',\r\n    source: 'EventGrid',\r\n    connection: '%connection%',\r\n    handler: (blob, context) => {\r\n        context.log(`Storage blob (using Event Grid) function processed blob \"${context.triggerMetadata.name}\" with size ${blob.length} bytes`);\r\n    }\r\n});\r\n"
+        },
+        "metadata": {
+            "defaultFunctionName": "eventGridBlobTrigger",
+            "description": "$BlobTrigger_description",
+            "name": "Azure Blob Storage Trigger (using Event Grid)",
+            "language": "JavaScript",
+            "triggerType": "blobTrigger",
+            "category": [
+                "$temp_category_core",
+                "$temp_category_dataProcessing"
+            ],
+            "categoryStyle": "blob",
+            "enabledInTryMode": true,
+            "userPrompt": [
+                "connection",
+                "path"
+            ]
+        }
+    },
+    {
+        "id": "EventGridBlobTrigger-TypeScript-4.x",
+        "runtime": "2",
+        "files": {
+            "%functionName%.ts": "import { app, InvocationContext } from \"@azure/functions\";\r\n\r\nexport async function %functionName%(blob: Buffer, context: InvocationContext): Promise<void> {\r\n    context.log(`Storage blob function processed blob \"${context.triggerMetadata.name}\" with size ${blob.length} bytes`);\r\n}\r\n\r\napp.storageBlob('%functionName%', {\r\n    path: '%path%',\r\n    source: 'EventGrid',\r\n    connection: '%connection%',\r\n    handler: %functionName%\r\n});\r\n"
+        },
+        "metadata": {
+            "defaultFunctionName": "eventGridBlobTrigger",
+            "description": "$BlobTrigger_description",
+            "name": "Azure Blob Storage Trigger (using Event Grid)",
+            "language": "TypeScript",
+            "triggerType": "blobTrigger",
+            "category": [
+                "$temp_category_core",
+                "$temp_category_dataProcessing"
+            ],
+            "categoryStyle": "blob",
+            "enabledInTryMode": true,
+            "userPrompt": [
+                "connection",
+                "path"
+            ]
+        }
+    },
     {
         "id": "EventGridTrigger-CSharp",
         "runtime": "2",