Remove gofumports which is not a valid option anymore (#37619)

<img width="1446" height="248" alt="Screenshot 2025-12-22 at 5 28 43 PM"
src="https://github.com/user-attachments/assets/ae807a64-247f-4cdd-9a12-8bc5e42f6053"
/>

.vscode/settings.json

@@ -6,7 +6,6 @@
     "diffEditor.codeLens": true,
     "rewrap.autoWrap.enabled": true,
     "rewrap.wrappingColumn": 100,
-    "go.formatTool": "gofumports",
     "go.lintTool": "golangci-lint",
     "go.useLanguageServer": true,
     "gopls": {