Reproduction - Cloudflare adapter hangs process using Vitest

[skf-funzt]

Changes

• Added a reproduction package
• Added asdf for local development

Testing

• Added test and respective GitHub workflow to showcase haning process using vitest

Docs

• Issue Cloudflare adapter hangs process using Vitest astro#13160
• 👉 The CI run for different Node versions

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[alexanderniebuhr]

Blocking, to make sure this doesn't get merged by accident.

[ematipico]

Hi, we moved the cloudflare adapter in a new repository: https://github.com/withastro/astro/tree/main/packages/integrations/cloudflare

We will achieve this repository soon, so if you wish to land this PR, you'll have to create a new one.