fix hc-scaffold cranelib filters

[c12i]

This PR addresses an issue where UI elements for entry/link types and collections were not being scaffolded when using the hc-scaffold nix package from holochain/holonix.

Changes made:

1. Updated source filtering in cranelib.BuildPackage to include handlebars templates
2. Ensured that templates for scaffolding entry/link types and collections are properly packaged

This fix resolves the inconsistency between global cargo installation and nix shell usage of the scaffolding CLI, ensuring that all necessary templates are available regardless of the installation method.

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Should be backported to main-0.3

[jost-s]

Just a repeated declaration, otherwise LGTM.

[ThetaSinner]

I'm not convinced by this. Negative includes are an easy way to make a different kind of mistake. Why not just update the positive include to cover the necessary file types?

This also means that things like uncommitted shell scripts kept in repositories (something I do) or test happ files etc, will mess with Nix's change detection and cause unnecessary rebuilds and waste space in the store.

This is one of the reasons that the new Holonix is performing better, is that it's tried to be clean about these kinds of things.

[jost-s]

Agreed. I was too quick to approve. @c12i Please use a positive include with just the additional files you need for scaffolding.

[c12i]

Thanks for the feedback @ThetaSinner, I assumed the same approach I took with the scaffold package would suffice here as well. I recognize that both implementations could benefit from improvement. I'll open a separate PR to address this.