sbt-extras: Convert VM test into installCheckPhase

nixos/tests/all-tests.nix

@@ -345,7 +345,6 @@ in
   samba-wsdd = handleTest ./samba-wsdd.nix {};
   sanoid = handleTest ./sanoid.nix {};
   sbt = handleTest ./sbt.nix {};
-  sbt-extras = handleTest ./sbt-extras.nix {};
   sddm = handleTest ./sddm.nix {};
   searx = handleTest ./searx.nix {};
   service-runner = handleTest ./service-runner.nix {};

nixos/tests/sbt-extras.nix

@@ -1,16 +0,0 @@
-import ./make-test-python.nix ({ pkgs, ...} : {
-  name = "sbt-extras";
-  meta = with pkgs.lib.maintainers; {
-    maintainers = [ nequissimus ];
-  };
-
-  machine = { pkgs, ... }:
-    {
-      environment.systemPackages = [ pkgs.sbt-extras ];
-    };
-
-  testScript =
-    ''
-      machine.succeed("(sbt -h)")
-    '';
-})