[PLAY-1526] Add comment script (#3717)

**What does this PR do?** A clear and concise description with your
runway ticket url.
Runway https://runway.powerhrg.com/backlog_items/PLAY-1526

When an RC is made (when you merge master) the github action will add a
comment with links to the rc versions on npm and ruby gems

just like we do for alphas

The curl syntax for adding a comment works 


![screenshot-github_com-2024_09_23-15_31_35](https://github.com/user-attachments/assets/a94ba101-b309-4038-888c-2bbf08944b1d)

.github/workflows/github-actions-release-candidate.yml

@@ -102,4 +102,17 @@ jobs:
           gh release create v${{ env.new_npm_version }} \
             --title "Release Candidate v${{ env.new_npm_version }}" \
             --notes "This is a release candidate version. Please test thoroughly before promoting to a stable release." \
-            --prerelease
+            --prerelease
+      - name: Leave PR comment
+        env:
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          RUBY_GEM_VERSION: ${{ env.new_ruby_version }}
+          RUBY_GEM_LINK: https://rubygems.org/gems/playbook_ui/versions/${{env.new_ruby_version}}
+          NPM_VERSION: ${{ env.new_npm_version }}
+          NPM_LINK: https://www.npmjs.com/package/playbook-ui/v/${{env.new_npm_version}}
+        run: |
+          curl -H "Authorization: token ${GITHUB_TOKEN}" \
+              -X POST \
+              -d '{"body": "Release Candidate Created \n\n Your RC for Ruby Gems is [${{env.RUBY_GEM_VERSION}}](${{env.RUBY_GEM_LINK}}) \n\n Your RC for NPM is [${{env.NPM_VERSION}}](${{env.NPM_LINK}}) "}' \
+                "https://api.github.com/repos/${{ github.repository }}/issues/${PR_NUMBER}/comments"