inter,inter-ui: keep font name the same for attributes, split off

[dtzWill]

Feedback please! This is one solution to the problem,
but since it's a small amount of work wanted an actual PR
and so if we like it it's easy to proceed.

Motivation for this change

#57605 (comment)

From upstream repository activity, it appears they're working
to be included in google fonts?
However I'm not sure it's worth "waiting" on that,
and it's nice to have the font you wnt directly sometimes
instead of the big bundle :).

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nix-review --run "nix-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Assured whether relevant documentation is up to date
• Fits CONTRIBUTING.md.

---

[ivan]

Thanks! I tested this with pkgs.inter in my fonts.fonts and it seems to be working.

[dtzWill]

@GrahamcOfBorg build inter inter-ui

[dtzWill]

Merging before it becomes even more messy to do so :).