skip tests when building nodejs dependency for nix flake

[hattyhattington17]

There is a known issue with nix 24.11 when building node 20.19.0 on mac https://github.com/NixOS/nixpkgs/issues/402079

For now we can disable the nodejs package's tests so that the devshells continue to work for mac users.

[hattyhattington17]

!ci-build-me

[glyh]

Or alternatively we could bump nixpkgs it seems:

https://github.com/NixOS/nixpkgs/pull/407990

@georgeee

[glyh]

!ci-build-me

[glyh]

We might want to check if https://github.com/MinaProtocol/mina/pull/17634 could replace this as well