issue with build.sh and CI script

Hey, when fixing up my forked bundle to generate mpy files again (CI died after 2yrs of no changes), it had problems with the package names and didn't generate expected assets.

https://github.com/good-enough-technology/CircuitPython_GoodEnough_Bundle/pull/1

This PR was claude working through it with a mini fix until I asked about path based injection as the steps chain, classically it had made things worse...

Anyway, here's a single commit that avoids the chaining risk and fixes the issue.
There's probably a more elegant solution, but my Fable budget is low so this was opus😄

#290

-edit-
` package_folder_prefix is only consulted when a library has no [tool.setuptools] metadata in pyproject.toml. `

Inizia leggendo build.sh e lo script CI, quindi confronta il loro comportamento relativo ai nomi dei pacchetti e alla generazione degli asset con la pull request del fork indicata e l’issue #290. Controlla i metadati pertinenti di pyproject.toml e considera completato il lavoro quando il bundle genera in CI gli asset mpy previsti con i nomi dei pacchetti corretti.

Scritto dal modello di indicizzazione a partire dal testo della issue.