Fix/markdoc assets

[Princesseuh]

Changes

A previous PR removed emitESMImage from astro/assets/index.js to fix Vercel Edge support, however, the Markdoc integration imported that. We didn't catch it for two reasons:

• Due to moduleResolution: 'node' not being able to get the types properly, there's a @ts-expect-error there, so type checking didn't fail
• For CI performance reason, we don't run the CI of every single integration on all core changes, so the tests fails weren't caught

Fix #7705

Testing

Tests should pass!

Docs

N/A

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[bluwy]

It might be a slight breaking change for markdoc still, since it now requires the latest Astro version to work, but I think it's better that reverting the other fix that causes another regression.

[Princesseuh]

It might be a slight breaking change for markdoc still, since it now requires the latest Astro version to work, but I think it's better that reverting the other fix that causes another regression.

Surface area is small, it's only broken in specifically 2.8.4, so users can choose to stay on 2.8.3 or update the Markdoc integration. It's a tiny bit annoying, but it's not too bad