`gotest` doesn't work for projects with dependencies

[winterqt]

As with the Rust situation, gotest fails in pre-commit drvs because it can't grab dependencies.

Workaround:

{ config, ... }:

let
  deps = (pkgs.buildGoModule {
    name = "go-deps";
    src = config.rootSrc;
    vendorHash = "...";
  }).goModules;

  goSetupHook = pkgs.makeSetupHook {
    name = "go-setup-hook";
    substitutions = {
      shell = lib.getExe pkgs.bash;
      inherit deps;
    };
  } (pkgs.writeScript "go-setup-hook.sh" ''
    #!@shell@

    goSetupPostUnpackHook() {
      echo "copying go deps"
      cp -r --reflink=auto @deps@ "$sourceRoot/vendor"
    }

    postUnpackHooks+=(goSetupPostUnpackHook)
  '');
in
{
  hooks.gotest.enable = true;
  hooks.gotest.package = pkgs.go; # not strictly required, but good to keep the deps FOD Go ver in sync with this one
  hooks.gotest.extraPackages = [ goSetupHook ];

We can easily fix it by just copying the Rust work around, but this does beg two larger questions worth pondering:

1. Is there a better way to handle this in the hook module, generically? e.g. a setupHooks option that can propagate to the check drv, but does not propagate to enabledPackages like above does. (Technically there's ways to make enabledPackages work now even in that case, but they're obviously not ideal.)
2. Should more test cases be added? 99% of the hooks here are not tested in CI, leading lots of pretty glaring bugs like this just lurking.

Happy to help with the implementation(s) of any of these points. :)