chore(docs): add empty changeset step to actions (#6377)

- Creates a script that runs the `yarn changeset --empty` command if there are file changes. This is important to not create PRs of just empty changesets if there are no file changes.
- Run script in all docs-generation PRs
- Fix to condition in `generate-docblock` action

.github/workflows/generate-docblocks-reference.yml

@@ -64,6 +64,10 @@ jobs:
         run: "yarn generate:reference all"
         working-directory: docs-util/packages/scripts
 
+      - name: Generate Changeset
+        run: "yarn generate:changeset"
+        working-directory: docs-util/packages/scripts
+
       - name: Get PR Message
         id: pr-message
         run: yarn generate:message