Show the archive URL when downloading a CI/CD package

Context

Will help us debug Make the compile-production-assets job faster, as we now have cache misses in FOSS pipelines.

What does this MR do and why?

Show the archive URL before downloading it. It's currently not very easy to guess it :

export GITLAB_ASSETS_PACKAGE_URL="${API_PACKAGES_BASE_URL}/assets/${NODE_ENV}-${GITLAB_EDITION}-${GITLAB_ASSETS_HASH}/${GITLAB_ASSETS_PACKAGE}"

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