feat(n8n Node): Add dependabot and editor extension recommendations to the project template

Every n8n-node new scaffold ships lint/format tooling (ESLint, Prettier)
but had no dependabot config to keep its own dependencies current, and
no .vscode/extensions.json nudging contributors toward the matching
editor extensions.

This was found while auditing scaffold drift between n8n-nodes-starter
and the templates it's generated from: n8n-nodes-starter already carries
both files by hand, which is exactly the kind of divergence the new
util-refresh-starter-scaffold.yml workflow in n8n-io/n8n is meant to
catch and close going forward.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

packages/@n8n/node-cli/src/template/templates/shared/default/.github/dependabot.yml

@@ -0,0 +1,14 @@
+version: 2
+updates:
+  - package-ecosystem: 'npm'
+    directory: '/'
+    schedule:
+      interval: 'weekly'
+    groups:
+      minor-and-patch:
+        update-types: ['minor', 'patch']
+
+  - package-ecosystem: 'github-actions'
+    directory: '/'
+    schedule:
+      interval: 'monthly'

packages/@n8n/node-cli/src/template/templates/shared/default/.vscode/extensions.json

@@ -0,0 +1,7 @@
+{
+	"recommendations": [
+		"dbaeumer.vscode-eslint",
+		"EditorConfig.EditorConfig",
+		"esbenp.prettier-vscode"
+	]
+}