fix: vitest workerd configuration

[NachoVazquez]

PR Checklist

Please check if your PR fulfills the following requirements:

• [x] The commit message follows our guidelines: CONTRIBUTING.md#commit
• [x] Tests for the changes have been added (for bug fixes / features)
• [x] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

The current configuration and generated files for tests are not working.

What is the new behavior?

We have replicated a working configuration in a clean project and made here the proper changes to fix the tests.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

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