Fix PO generation workflow

[sarayourfriend]

Fixes

Follow up to #1535 @sarayourfriend

Description

As @zackkrida pointed out in the original #1051 issue, the workflow is not working due to not being able to checkout the translations branch. I'm trying to fix that here.

Testing Instructions

Checkout the workflow runs and confirm that it works in this PR.

Checklist

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• [N/A] I added or updated tests for the changes I made (if applicable).
• [N/A] I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.

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[github-actions]

Storybook and Tailwind configuration previews: Ready

Storybook: https://wordpress.github.io/openverse-frontend/1550
Tailwind: https://wordpress.github.io/openverse-frontend/1550/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.

[sarayourfriend]

Okay, there was a post-run issue with the setup-node-env that seems to just be an intermittent failure. But the rest of the workflow ran successfully and you can see the commit it made here: 04c5da3

Here is the run in question: https://github.com/WordPress/openverse-frontend/runs/7124031759?check_suite_focus=true

I'm removing the testing code now and then this will be ready for review. Whoever is second to approve it feel free to merge it at your leisure if it is after EOD for me.

[sarayourfriend]

Actually, I realized why the cleanup failed. Details in the message attached to this commit: 1146aa4

[obulat]

Nice!

[zackkrida]

Ah, multiple scoped checkouts should be faster than my suggestion. This looks right 🤞