Feat: add error page to edge functions for local dev

[khendrikse]

Summary

Fixes #4655.

Whenever someone runs netlify dev we want people to have a proper error page available for them with a full stacktrace if an edge function has an unhandled error.

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[github-actions]

📊 Benchmark results

Comparing with 91506bb

Package size: 223 MB

⬇️ 0.00% decrease vs. 91506bb

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Legend

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• T (current commit): 223 MB

[eduardoboucas]

Left a few comments, but nothing blocking. Great work! ✨

[eduardoboucas]

What would it take for us to use the same template for both types of functions? Are they all that different? 🤔

[khendrikse]

There are some differences right now in some of the texts, and some of the links... I also saw some things in the normal functions template that I'm pretty sure we won't use for the edge functions template, but that I'm not sure about if we use it still for normal functions. So I felt unsure as to combine the two.

I could pass the differences as arguments, but something about that feels off a bit as well because the amount of arguments will grow quite a bit.

[khendrikse]

I've asked some input from the team, if it's all good to clear out some old stuff we don't need anymore I'll merge the two :)

[eduardoboucas]

Do we need to check for the status code? I would think that the presence of the header alone should indicate an uncaught error.

[khendrikse]

I do think it's a good check either way, if only from the perspective of readability, as we do set the header ourselves and a 500 is a clear message to the reader that we're dealing with an error.

[eduardoboucas]

My concern is that the check is not broad enough. If the bootstrap starts producing an uncaught error with a different status code, the CLI will need to adjust to that.

[khendrikse]

O yeah that makes sense :) In that case I will actually change it