As noted in #46242, the `known-actions.ts` file was getting a bit big.
Where we have dynamic extractions, using `transform`, we split these
into a `<datasource>-dynamic.ts` file.
Where we have multiple packages extracted from the same Action, we use
`multiple.ts`.
Per suggestion from Sebastian, we can break this down by the datasource
used by the Action's inputs.
We can also try to enforce the structure of the directories by adding a
test in each file.
Co-authored-by: Claude Sonnet 5 <jamie.tanna+claude-code@mend.io>