Direct EOY banner to use onboarding flow

[mchowning]

Description

This makes it so that the EOY banner uses the onboarding flow instead of the old AccountActivity sign in screen.

Related to #1499 (but does not entirely fix that issue since we still have AccountActivity code in other places).

Testing Instructions

1. Fresh install the app
2. Tap on the EOY banner on the profile screen
3. ✅ Observe that you are taken to the OnboardingFlow sign in screen (easy to tell because this screen has a Google Sign In option whereas the old AccountActivity screen does not provide that option).
4. Sign in
5. ✅ Observe that after sign in you are taken to the EOY stories
6. Exit the EOY stories
7. Tap on the EOY banner again
8. ✅ Observe that you are taken to the EOY stories

Video

Screen.Recording.2023-10-30.at.2.16.24.PM.mov

Checklist

• If this is a user-facing change, I have added an entry in CHANGELOG.md
• Ensure the linter passes (./gradlew spotlessApply to automatically apply formatting/linting)
• I have considered whether it makes sense to add tests for my changes
• All strings that need to be localized are in modules/services/localization/src/main/res/values/strings.xml
• Any jetpack compose components I added or changed are covered by compose previews

[ashiagr]

Works as described, thanks for this!