Set onboarding completed for sync end to end tests (#3259)

Task/Issue URL: https://app.asana.com/0/1206329551987282/1208109718041794/f

**Description**:
Fix Sync UI Tests by setting the env variable ONBOARDING_COMPLETED to true. This flag ensure that the onboarding educational dialogs are not shown during the sync tests removing the need of dismissing them with manual user interactions.

.github/workflows/sync-end-to-end.yml

@@ -102,8 +102,8 @@ jobs:
         
     - name: Sync e2e tests 
       run: |
-        export PATH="$PATH":"$HOME/.maestro/bin"; maestro cloud --apiKey ${{ secrets.MAESTRO_CLOUD_API_KEY }} --env=CODE=${{ steps.sync-recovery-code.outputs.recovery-code }} --fail-on-timeout=true --fail-on-cancellation=true --timeout=150 --ios-version=${{ matrix.os-version }} --include-tags=sync DerivedData/Build/Products/Debug-iphonesimulator/DuckDuckGo.app .maestro/
-        
+        export PATH="$PATH":"$HOME/.maestro/bin"; maestro cloud --apiKey ${{ secrets.MAESTRO_CLOUD_API_KEY }} -e ONBOARDING_COMPLETED=true --env=CODE=${{ steps.sync-recovery-code.outputs.recovery-code }} --fail-on-timeout=true --fail-on-cancellation=true --timeout=150 --ios-version=${{ matrix.os-version }} --include-tags=sync DerivedData/Build/Products/Debug-iphonesimulator/DuckDuckGo.app .maestro/
+
     - name: Reset config
       run: |
         git checkout .maestro/config.yaml