Grafana UI: Bump storybook to 6.4.4 (#42634)

* chore(storybook): bump dependencies to 6.4.4

* chore(yarn): update packageExtensions to match latest storybook

* fix(storybook): get webpack builds to pass

* fix(storybook): theme switching works in docs

* fix(storybook): use text logo so accessibility link doesnt break layout

package.json

@@ -378,7 +378,7 @@
     "@rushstack/node-core-library": "3.43.2",
     "@rushstack/rig-package": "0.3.3",
     "@rushstack/ts-command-line": "4.10.2",
-    "@storybook/react/webpack": "5.58.1"
+    "@storybook/react/webpack": "5.63.0"
   },
   "workspaces": {
     "packages": [