test: remove deprecated earn-badge test and related badge UI

Remove the acceptance test for earning badges on the course page 
and all associated UI components, badge data fetching, and page 
elements. These changes simplify the course stage instructions and 
repository poller by eliminating badge award logic and cleanup 
unused code. This cleanup reflects a shift away from badge earning 
notifications in the UI to reduce test complexity and maintain code 
clarity.

Author: rohitpaulk

app/components/course-page/course-stage-step/earned-badge-notice.hbs

@@ -25,12 +25,6 @@ export default class CourseStageInstructionsController extends Controller {
     activeRepository: RepositoryModel;
   };
 
-  get badgeAwards() {
-    return this.model.activeRepository.courseStageCompletions.filterBy('courseStage', this.model.courseStage).flatMap((courseStageCompletion) => {
-      return courseStageCompletion.badgeAwards;
-    });
-  }
-
   get currentCourse() {
     return this.model.courseStage.course;
   }

app/components/course-page/course-stage-step/earned-badge-notice.ts

@@ -19,10 +19,6 @@
           />
         {{/if}}
 
-        {{#if (gt this.badgeAwards.length 0)}}
-          <CoursePage::CourseStageStep::EarnedBadgeNotice @badgeAwards={{this.badgeAwards}} class="mb-6" />
-        {{/if}}
-
         {{#if @model.courseStage.isFirst}}
           <CoursePage::CourseStageStep::FirstStageTutorialCard
             @repository={{@model.activeRepository}}

app/controllers/course/stage/instructions.ts

@@ -12,12 +12,6 @@ export default class RepositoryPoller extends Poller {
     'course',
     'course.extensions',
     'user',
-    'user.badge-awards',
-    'user.badge-awards.badge',
-    'user.badge-awards.user',
-    'user.badge-awards.course-stage-completion',
-    'user.badge-awards.course-stage-completion.course-stage',
-    'user.badge-awards.course-stage-completion.repository',
     'course-stage-completions',
     'course-stage-completions.course-stage',
     'course-stage-feedback-submissions',

app/templates/course/stage/instructions.hbs

@@ -116,17 +116,6 @@ export default create({
   },
 
   header: Header,
-
-  earnedBadgeNotice: {
-    badgeEarnedModal: {
-      badgeName: text('[data-test-badge-name]'),
-      resetScope: true,
-      scope: '[data-test-badge-earned-modal]',
-    },
-
-    scope: '[data-test-earned-badge-notice]',
-  },
-
   feedbackPrompt: FeedbackPrompt,
   firstStageTutorialCard: FirstStageTutorialCard,