refactor: simplify StepContentComponent by removing state

Removes unnecessary tracked properties and actions from the 
StepContentComponent. This streamlines the component's logic, 
eliminating the previous steps incomplete modal handling which 
is no longer needed. This change enhances readability and 
maintainability of the code.

Author: rohitpaulk

app/components/course-page/step-content.ts

@@ -1,9 +1,5 @@
-import { action } from '@ember/object';
-import { service } from '@ember/service';
 import Component from '@glimmer/component';
-import { tracked } from '@glimmer/tracking';
 import type RepositoryModel from 'codecrafters-frontend/models/repository';
-import type CoursePageStateService from 'codecrafters-frontend/services/course-page-state';
 import Step from 'codecrafters-frontend/utils/course-page-step-list/step';
 
 interface Signature {
@@ -20,33 +16,9 @@ interface Signature {
 }
 
 export default class StepContentComponent extends Component<Signature> {
-  @tracked previousStepsIncompleteModalWasDismissed = false;
-  @tracked lastSeenStepId: string | null = null;
-
-  @service declare coursePageState: CoursePageStateService;
-
   get shouldHideCompletionNotice(): boolean {
     return this.args.step.type === 'IntroductionStep' || this.args.step.type === 'SetupStep';
   }
-
-  get shouldShowPreviousStepsIncompleteModal(): boolean {
-    return !this.previousStepsIncompleteModalWasDismissed && this.args.step.status === 'locked';
-  }
-
-  @action
-  handlePreviousStepsIncompleteModalDismissed() {
-    this.previousStepsIncompleteModalWasDismissed = true;
-  }
-
-  @action
-  handleStepIdUpdated() {
-    if (this.args.step.id === this.lastSeenStepId) {
-      return;
-    }
-
-    this.lastSeenStepId = this.args.step.id;
-    this.previousStepsIncompleteModalWasDismissed = false;
-  }
 }
 
 declare module '@glint/environment-ember-loose/registry' {