Migrate from super.onBackPressed() to onBackPressedDispatcher.onBackP…

…ressed()

- Replaced the deprecated super.onBackPressed() method with onBackPressedDispatcher.onBackPressed()
- Ensures compatibility with newer Android SDK versions
- Updated necessary activities and fragments to use the new back pressed dispatcher
- Verified that back navigation works correctly with the toolbar back arrow, system back button, and tablet-specific behaviors

Activities and fragments corrected:
- app/src/main/java/org/oppia/android/app/settings/profile/ProfileEditActivity
- app/src/main/java/org/oppia/android/app/settings/profile/ProfileEditActivityPresenter
- app/src/main/java/org/oppia/android/app/topic/questionplayer/QuestionPlayerActivityPresenter
- app/src/main/java/org/oppia/android/app/walkthrough/end/WalkthroughFinalFragmentPresenter

Fixes oppia#5404

app/src/main/java/org/oppia/android/app/settings/profile/ProfileEditActivity.kt

@@ -48,8 +48,7 @@ class ProfileEditActivity : InjectableAutoLocalizedAppCompatActivity() {
   override fun onBackPressed() {
     val isMultipane = intent.extras!!.getBoolean(IS_MULTIPANE_EXTRA_KEY, false)
     if (isMultipane) {
-      @Suppress("DEPRECATION") // TODO(#5404): Migrate to a back pressed dispatcher.
-      super.onBackPressed()
+      onBackPressedDispatcher.onBackPressed()
     } else {
       val intent = Intent(this, ProfileListActivity::class.java)
       intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)

app/src/main/java/org/oppia/android/app/settings/profile/ProfileEditActivityPresenter.kt

@@ -23,11 +23,9 @@ class ProfileEditActivityPresenter @Inject constructor(
 
     val profileId = activity.intent.getIntExtra(PROFILE_EDIT_PROFILE_ID_EXTRA_KEY, 0)
     val isMultipane = activity.intent.getBooleanExtra(IS_MULTIPANE_EXTRA_KEY, false)
-
     toolbar.setNavigationOnClickListener {
       if (isMultipane) {
-        @Suppress("DEPRECATION") // TODO(#5404): Migrate to a back pressed dispatcher.
-        activity.onBackPressed()
+        activity.onBackPressedDispatcher.onBackPressed()
       } else {
         val intent = Intent(activity, ProfileListActivity::class.java)
         intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)

app/src/main/java/org/oppia/android/app/topic/questionplayer/QuestionPlayerActivityPresenter.kt

@@ -47,8 +47,7 @@ class QuestionPlayerActivityPresenter @Inject constructor(
     activity.setSupportActionBar(binding.questionPlayerToolbar)
 
     binding.questionPlayerToolbar.setNavigationOnClickListener {
-      @Suppress("DEPRECATION") // TODO(#5404): Migrate to a back pressed dispatcher.
-      activity.onBackPressed()
+      activity.onBackPressedDispatcher.onBackPressed()
     }
 
     if (getQuestionPlayerFragment() == null) {

app/src/main/java/org/oppia/android/app/walkthrough/end/WalkthroughFinalFragmentPresenter.kt

@@ -106,7 +106,6 @@ class WalkthroughFinalFragmentPresenter @Inject constructor(
   }
 
   override fun goBack() {
-    @Suppress("DEPRECATION") // TODO(#5404): Migrate to a back pressed dispatcher.
-    activity.onBackPressed()
+    activity.onBackPressedDispatcher.onBackPressed()
   }
 }