fix(@angular-devkit/build-angular): preserve css type for jasmine.css

We should only force the type for files that we know are JavaScript.
Otherwise we risk breaking the magic type detection done by Karma.

The previous code broke for `jasmine.css`.

Fixes #29190

(cherry picked from commit 916979c)

Author: jkrems

packages/angular_devkit/build_angular/src/builders/karma/application_builder.ts

@@ -156,7 +156,7 @@ class AngularPolyfillsPlugin {
               // page load. `type` won't affect them.
               continue;
             }
-            if ('js' === (f.type ?? 'js')) {
+            if (f.pattern.endsWith('.js') && 'js' === (f.type ?? 'js')) {
               f.type = 'module';
             }
           }