Docs: generate packages docs before syncing to website (#27879)

* updated to latest version of api-documenter.

* saved lockfile after upgrade.

* adding yarn to docker environment.

* adding packages to trigger paths.

* added steps to workflow for generating docs.

* reverted back to api-documenter 0.9.3

package.json

@@ -75,6 +75,7 @@
     "@emotion/core": "10.0.27",
     "@grafana/api-documenter": "0.9.3",
     "@grafana/eslint-config": "2.0.3",
+    "@grafana/api-extractor": "7.10.1",
     "@rtsao/plugin-proposal-class-properties": "7.0.1-patch.1",
     "@testing-library/jest-dom": "^5.11.3",
     "@testing-library/react": "^10.4.8",
@@ -205,7 +206,6 @@
     "zone.js": "0.7.8"
   },
   "dependencies": {
-    "@grafana/api-extractor": "7.10.1",
     "@grafana/slate-react": "0.22.9-grafana",
     "@reduxjs/toolkit": "1.3.4",
     "@torkelo/react-select": "3.0.8",