Update CI image to use node image directly

What does this MR do and why?

Update CI image to use node image directly

References

This is an attempt to resolve https://gitlab.com/gitlab-org/cells/http-router/-/jobs/9433170165 from !569 (merged)

Not sure if that can fix it, but I see no strong reason to use a custom image when we only need node.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

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