Chore: Some renovate config tidy up (#77275)

* update some comments, remove some things from the ignore list

* remove @mdx-js/react since storybook now directly depends on it

* add issue link to comment

* exclude @locker from grouped patch updates

* ignore grafana-e2e from renovate

packages/grafana-ui/package.json

@@ -117,7 +117,6 @@
   "devDependencies": {
     "@babel/core": "7.23.2",
     "@grafana/tsconfig": "^1.2.0-rc1",
-    "@mdx-js/react": "1.6.22",
     "@rollup/plugin-node-resolve": "15.2.3",
     "@storybook/addon-a11y": "7.4.5",
     "@storybook/addon-actions": "7.4.5",