Cleaned up subgrunt usage between Ghost and Admin

refs https://github.com/TryGhost/Toolbox/issues/365

- some of this was barely used anyway, but now Admin is a package in the
  monorepo, we don't need to be installing dependencies twice

ghost/admin/Gruntfile.js

@@ -27,10 +27,6 @@ module.exports = function (grunt) {
         },
 
         shell: {
-            'npm-install': {
-                command: 'yarn install'
-            },
-
             ember: {
                 command: function (mode) {
                     let liveReloadBaseUrl = grunt.option('live-reload-base-url') || '/ghost/';
@@ -54,17 +50,9 @@ module.exports = function (grunt) {
                 command: 'csscomb -c app/styles/csscomb.json -lv app/styles'
             },
 
-            test: {
-                command: 'npm test'
-            },
-
             options: {
                 preferLocal: true
             }
         }
     });
-
-    grunt.registerTask('init', 'Install the admin dependencies',
-        ['shell:npm-install']
-    );
 };

ghost/core/Gruntfile.js

@@ -25,7 +25,7 @@ module.exports = function (grunt) {
     // grunt build -- use yarn build instead!
     // - Builds the admin without a watch task
     grunt.registerTask('build', 'Build admin app in development mode',
-        ['subgrunt:init', 'clean:tmp', 'ember']);
+        ['clean:tmp', 'ember']);
 
     // Runs the asset generation tasks for production and duplicates default-prod.html to default.html
     grunt.registerTask('release', 'Release task - creates a final built zip', ['clean:built', 'prod']);
@@ -34,8 +34,7 @@ module.exports = function (grunt) {
     // Used to make other commands work
 
     // Updates submodules, then installs and builds the admin for you
-    grunt.registerTask('init', 'Prepare the project for development',
-        ['update_submodules:pinned', 'build']);
+    grunt.registerTask('init', 'Prepare the project for development', 'build');
 
     // Runs ember dev
     grunt.registerTask('ember', 'Build JS & templates for development',
@@ -152,16 +151,6 @@ module.exports = function (grunt) {
             }
         },
 
-        // grunt-update-submodules
-        // Grunt task to update git submodules
-        update_submodules: {
-            pinned: {
-                options: {
-                    params: '--init'
-                }
-            }
-        },
-
         // grunt-subgrunt
         // Run grunt tasks in submodule Gruntfiles
         subgrunt: {
@@ -170,15 +159,6 @@ module.exports = function (grunt) {
                 npmPath: 'yarn'
             },
 
-            init: {
-                options: {
-                    npmInstall: true
-                },
-                projects: {
-                    '../admin': 'init'
-                }
-            },
-
             dev: {
                 '../admin': 'shell:ember:dev'
             },
@@ -220,7 +200,6 @@ module.exports = function (grunt) {
     grunt.loadNpmTasks('grunt-contrib-watch');
     grunt.loadNpmTasks('grunt-express-server');
     grunt.loadNpmTasks('grunt-subgrunt');
-    grunt.loadNpmTasks('grunt-update-submodules');
 
     // This little bit of weirdness gives the express server chance to shutdown properly
     const waitBeforeExit = () => {

ghost/core/package.json

@@ -208,7 +208,6 @@
     "grunt-contrib-watch": "1.1.0",
     "grunt-express-server": "0.5.4",
     "grunt-subgrunt": "1.3.0",
-    "grunt-update-submodules": "0.4.1",
     "inquirer": "8.2.4",
     "jwks-rsa": "2.1.4",
     "mocha": "10.0.0",

yarn.lock

@@ -12929,11 +12929,6 @@ grunt-subgrunt@1.3.0:
     async "^2.1.2"
     glob "^7.0.0"
 
-grunt-update-submodules@0.4.1:
-  version "0.4.1"
-  resolved "https://registry.yarnpkg.com/grunt-update-submodules/-/grunt-update-submodules-0.4.1.tgz#46c485fe6413cc0bdd6988aa2803c4e7d997c366"
-  integrity sha512-Pv3rr6XB3RZJUuCrxANVN8NT5N3+u4541pe+KIve8c6lqpKNJh6yQxO+utsXEKSUm4IFzdWAYOKYKZ77h0EETg==
-
 grunt@1.5.3:
   version "1.5.3"
   resolved "https://registry.yarnpkg.com/grunt/-/grunt-1.5.3.tgz#3214101d11257b7e83cf2b38ea173b824deab76a"