Add action to update PR description with netlify staging links

[MongoCaleb]

Pull Request Info - SDK Docs Consolidation

Jira ticket: DOCSP-42152

Release Notes

• Adds a new GitHub Action that generates staging links and inserts them into the PR description.

[netlify]

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To edit notification comments on pull requests, go to your Netlify site configuration.

[dacharyc]

Let's give it a try and see how it works! If it's too much of a hassle on the consolidation PRs, we can always remove the placeholders from the template until the project is complete.

[docs-builder-bot]

✨ Staging URL: https://preview-mongodbmongodb.gatsbyjs.io/realm/master/

🪵 Logs

• job log: 5ea077980114d02d60d39609a7c270b1f4c61f61