fix: Page error codes

[tlgimenes]

What's the purpose of this pull request?

This PR fixes a bug introduced on #88. Also, fixes one of the TODOs regarding GraphQL status code.

How does it work?

#88 fixed wrong 404s on PDPs when an error occurred between function -> ecommerce API. This fix, however, didn't take into account that users entering wrong slugs should still get a 404, not a 500. This PR fixes all of these problems.

To way it works is that now it reads the error status thrown inside @faststore/api before returning the response.

How to test it?

1. Pick a PDP, say /4k-philips-monitor-99988213/p
2. When visiting /4k-philips-monitor-99988213/p you should get a 200 with the right page being rendered
3. Visiting a non existing page, say ``/4k-philips-monitor/p` should get you a 404 page
4. When an error occurs between function -> ecommerce API, you should get a 500. (To simulate this behavior, run locally and turn off the wifi)

References

Also, check the reference PR on @faststore/api

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📝 Based on commit c248449

Lighthouse Report by page
📎   /
📎   /apple-magic-mouse-99988212/p
📎   /office