test(bazel): Integration test for Sass support (#28297)

Add .sass files to the integration test for bazel-schematics.

Also addressed Alex's comment in
https://github.com/angular/angular/pull/28167/files#r248149866
about the unit tests being too brittle.

PR Close #28297

integration/bazel-schematics/angular.json.original

@@ -23,7 +23,7 @@
               "src/assets"
             ],
             "styles": [
-              "src/styles.css"
+              "src/styles.scss"
             ],
             "scripts": []
           },
@@ -82,7 +82,7 @@
             "tsConfig": "src/tsconfig.spec.json",
             "karmaConfig": "src/karma.conf.js",
             "styles": [
-              "src/styles.css"
+              "src/styles.scss"
             ],
             "scripts": [],
             "assets": [

integration/bazel-schematics/test.sh

@@ -7,10 +7,11 @@ function testBazel() {
   bazel version
   rm -rf demo
   # Create project
-  ng new demo --collection=@angular/bazel --defaults --skip-git
+  ng new demo --collection=@angular/bazel --defaults --skip-git --style=scss
   node replace_angular_repo.js "./demo/WORKSPACE"
   cd demo
   cp ../package.json.replace ./package.json
+  ng generate component widget --style=css
   ng build
   ng test
   ng e2e