DEV: Refactor bowerDependencies patch (#24437)

Moves the patch from ember-source to ember-cli so that it's easier for us to feature-flag an ember-source upgrade without fighting with patch-package. We'll be able to remove this patch once we're fully on Ember 5.x.

(ref https://github.com/discourse/discourse/pull/21720)

app/assets/javascripts/patches/ember-cli+5.0.0.patch

@@ -0,0 +1,16 @@
+diff --git a/node_modules/ember-cli/lib/models/project.js b/node_modules/ember-cli/lib/models/project.js
+index 7b3c7c9..e0c5fb9 100644
+--- a/node_modules/ember-cli/lib/models/project.js
++++ b/node_modules/ember-cli/lib/models/project.js
+@@ -716,6 +716,11 @@ class Project {
+     logger.info('getProjectRoot %s -> %s', process.cwd(), directory);
+     return directory;
+   }
++
++  // Allows us to use recent ember-cli with ember-source 3.28.12
++  bowerDependencies(){
++    return [];
++  }
+ }
+ 
+ class NotFoundError extends Error {

app/assets/javascripts/patches/ember-source+3.28.12.patch

@@ -1,18 +0,0 @@
-diff --git a/node_modules/ember-source/lib/index.js b/node_modules/ember-source/lib/index.js
-index ce887fbeb..8caf078c5 100644
---- a/node_modules/ember-source/lib/index.js
-+++ b/node_modules/ember-source/lib/index.js
-@@ -45,13 +45,6 @@ module.exports = {
-   init() {
-     this._super.init && this._super.init.apply(this, arguments);
- 
--    if ('ember' in this.project.bowerDependencies()) {
--      // TODO: move this to a throw soon.
--      this.ui.writeWarnLine(
--        'Ember.js is now provided by node_module `ember-source`, please remove it from bower'
--      );
--    }
--
-     // resets `this.root` to the correct location by default ember-cli
-     // considers `__dirname` here to be the root, but since our main entry
-     // point is within a subfolder we need to correct that