fix(build): generated entry

[ematipico]

Changes

The middleware is now dynamically imported, which means we don't need to have it at the top of entry.mjs

Closes PLT-2659

Testing

I tested locally and checked the emitted file. That import is unused, so there's no need for new tests.

Current CI should pass

Docs

N/A

[changeset-bot]

🦋 Changeset detected

Latest commit: c548eb2

The changes in this PR will be included in the next version bump.

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[codspeed-hq]

CodSpeed Performance Report

Merging #12477 will degrade performances by 11.86%

_{Comparing fix/middleware-import-ssr (c548eb2) with main (733d6c1)}

Summary

❌ 1 (👁 1) regressions
✅ 5 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	fix/middleware-import-ssr	Change
👁	Rendering: streaming [true], .mdx file	1 s	1.2 s	-11.86%

[florian-lefebvre]

Any reason why changes about globalThis are not in this PR?

[ematipico]

Any reason why changes about globalThis are not in this PR?

This fix has to be shipped regardless of astro:env. We generate an incorrect code nonetheless. Myself and Matthew agreed that we can ship this fix while we wait for a good fix for astro env

[florian-lefebvre]

This looks good but I think we should also get rid of the generated middleware.mjs file, as I did in #12326

[ematipico]

I'll submit a new PR if that's OK with you @florian-lefebvre