ci: ensure @lumeweb/portal-generators relies on @lumeweb/tsdown-config for building and use turbo build as the prepare hook

[pcfreak30]

This pull request updates the dependency configuration for @lumeweb/portal-generators by moving @lumeweb/tsdown-config from devDependencies to dependencies. This change ensures that the package correctly relies on the shared build configuration during the build lifecycle, specifically to support the use of turbo build as the prepare hook.

[kody-ai]

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