V14: Publish Bellissima package to npm via Pipelines (#14926)

* ignore node_modules specifically to limit size of build_output

* build and publish backoffice artifacts

* instruct GitVersioning to output all variables such as npm to use in Pipelines

* use NBGV variables

* prepare npm package for nightlies

* instruct to deploy to MyGet for nightlies

* Deploy to npm only after Myget

* add public access to publish

* write scopes to .npmrc file

* add scope to registry.npmjs.org

* nightly param

version.json

@@ -17,9 +17,7 @@
     "tagName": "release-{version}"
   },
   "cloudBuild": {
-    "setAllVariables": true,
-    "buildNumber": {
-      "enabled": true
-    }
+    "setVersionVariables": true,
+    "setAllVariables": true
   }
 }