Investigate typed metadata for validation packages

[kMutagene]

Currently, validation packages contain their metadata as yaml frontmatter.

This is suboptimal once that metadata is relevant for the output generated by the ARCExpect API (e.g. package name or version might not match).

[kMutagene]

As of nfdi4plants/arc-validate-package-registry@0049cf9 it is now possible to extract metadata inside a package from the frontmatter.

See also https://github.com/nfdi4plants/arc-validate-package-registry?tab=readme-ov-file#frontmatter-bindings.

This should be implemented in ARCExpect via the Execute API functions accepting ValidationPackageMetadata (or even directly the frontmatter string) to determine folder naming and use defaults for badge text and run summary. Note that now #95 can now also include full package metadata easily.