If the file index is of the appropriate type so we can leverage the contents of `PackageFileInfo`-type we try
to lookup the file mode to and pass it to the `readLicenseFileFromCafs`-function so it can be correctly
passed to the underlying `getFilePathByModeInCafs`-function responsible for fetching the file from
the PNPM store

Added a test to verify that the LICENSE files of the `svgicons2svgfont@5.0.2`-package
and similar packages can be read without errors