community/helix: add runtime subpackage

Upstream recommends[1][2] using tree-sitter grammars/queries they ship and not using them from other sources (e.g. tree-sitter).

Disabled tests also seem to run fine now.

Fixes #16336

1. https://docs.helix-editor.com/master/building-from-source.html#configuring-helixs-runtime-files
2. https://github.com/helix-editor/helix/discussions/9683