Only generate POT file if en.json5 has changed

[dhruvkb]

Description

Currently the workflow to update the POT file runs on every push to main. This is wasteful. This PR restricts the workflow to run only when the file en.json5 changes.

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[github-actions]

Full-stack documentation: Ready

https://WordPress.github.io/openverse/_preview/893

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[sarayourfriend]

The change to generate_pot.yml looks good to me to fix the issue described, but I am confused about the others.

[sarayourfriend]

LGTM. Thanks for explaining the paths-filter removal. I see now that the entire job already uses get-changes 👍

[zackkrida]

LGTM!