android-studio-preview: Remove the attribute (#59691)

This attribute and androidStudioPackages.preview are deprecated since
9aa46aedfe.

pkgs/applications/editors/android-studio/default.nix

@@ -23,16 +23,6 @@ let
     sha256Hash = "1g24a8fwnrfzdf093wdmqly3mzjddk5ndgi51qj98amn7kclsdpf";
   };
 in rec {
-  # Old alias (TODO @primeos: Remove after 19.03 is branched off):
-  preview = throw ''
-    The attributes "android-studio-preview" and "androidStudioPackages.preview"
-    are now deprecated and will be removed soon, please use
-    "androidStudioPackages.beta" instead. This attribute corresponds to the
-    beta channel, if you want the latest release you can use
-    "androidStudioPackages.dev" or "androidStudioPackages.canary" instead
-    (currently, there is no difference between both channels).
-  '';
-
   # Attributes are named by their corresponding release channels
 
   stable = mkStudio (stableVersion // {

pkgs/top-level/all-packages.nix

@@ -16439,7 +16439,6 @@ in
   androidStudioPackages = recurseIntoAttrs
     (callPackage ../applications/editors/android-studio { });
   android-studio = androidStudioPackages.stable;
-  android-studio-preview = androidStudioPackages.preview;
 
   animbar = callPackage ../applications/graphics/animbar { };