nixos/k3s: remove usages of with builtins

  mkManifestTarget =

    name: if (lib.hasSuffix ".yaml" name || lib.hasSuffix ".yml" name) then name else name + ".yaml";

  # Produces a list containing all duplicate manifest names

  duplicateManifests =

    with builtins;

    lib.intersectLists (attrNames cfg.autoDeployCharts) (attrNames cfg.manifests);

  duplicateManifests = lib.intersectLists (builtins.attrNames cfg.autoDeployCharts) (

    builtins.attrNames cfg.manifests

  );

  # Produces a list containing all duplicate chart names

  duplicateCharts =

    with builtins;

    lib.intersectLists (attrNames cfg.autoDeployCharts) (attrNames cfg.charts);

  duplicateCharts = lib.intersectLists (builtins.attrNames cfg.autoDeployCharts) (

    builtins.attrNames cfg.charts

  );

  # Converts YAML -> JSON -> Nix

  fromYaml =

    path:

    with builtins;

    fromJSON (

      readFile (

    builtins.fromJSON (

      builtins.readFile (

        pkgs.runCommand "${path}-converted.json" { nativeBuildInputs = [ pkgs.yq-go ]; } ''

          yq --no-colors --output-format json ${path} > $out

        ''