build: configure vscode bazel integration (#29279)

(cherry picked from commit c7ced66)

Author: mmalerba

.vscode/settings.json

@@ -21,5 +21,8 @@
     "editor.formatOnSave": true
   },
   "typescript.tsdk": "node_modules/typescript/lib",
-  "editor.rulers": [100]
+  "editor.rulers": [100],
+  "bazel.buildifierExecutable": "node_modules/.bin/buildifier",
+  "bazel.buildifierFixOnFormat": true,
+  "bazel.executable": "node_modules/.bin/bazel"
 }