Ping staging deployer in Slack notification

[krysal]

Fixes

Related to #2052 by @krysal

Description

This PRs updates .github/actions/staging-frontend-deploy/action.yml with the output from terraform.

Let's test on staging first to see if it works correctly, then once confirmed the same changes will be applied to the .github/actions/production-frontend-deploy/action.yml file.

Testing Instructions

Merge and trigger a staging deployment to confirm.

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[github-actions]

Storybook and Tailwind configuration previews: Ready

Storybook: https://wordpress.github.io/openverse-frontend/_preview/2053
Tailwind: https://wordpress.github.io/openverse-frontend/_preview/2053/tailwind

Please note that GitHub pages takes a little time to deploy newly pushed code, if the links above don't work or you see old versions, wait 5 minutes and try again.

You can check the GitHub pages deployment action list to see the current status of the deployments.

[obulat]

Excited to see how it works!
I think Zack's note needs to be added in the upstream implementation.

[krysal]

We'll see if this works by merging it right now 🤞