immich-machine-learning: move from immich.machine-learning

A top-level attribute makes sure Hydra builds it (though that already
happens on Linux through the NixOS test) and that nixpkgs-review picks
it up.

pkgs/by-name/im/immich-machine-learning/package.nix

@@ -1,6 +1,5 @@
 {
   lib,
-  src,
   fetchFromGitHub,
   immich,
   python3,
@@ -31,7 +30,7 @@ in
 python.pkgs.buildPythonApplication {
   pname = "immich-machine-learning";
   inherit (immich) version;
-  src = "${src}/machine-learning";
+  src = "${immich.src}/machine-learning";
   pyproject = true;
 
   postPatch = ''

pkgs/by-name/im/immich/package.nix

@@ -8,7 +8,7 @@
   node-gyp,
   runCommand,
   nixosTests,
-  callPackage,
+  immich-machine-learning,
   # build-time deps
   glib,
   pkg-config,
@@ -210,7 +210,7 @@ buildNpmPackage' {
       inherit (nixosTests) immich;
     };
 
-    machine-learning = callPackage ./machine-learning.nix { inherit src; };
+    machine-learning = immich-machine-learning;
 
     inherit
       src