[Fix] Xiaomi notification click not foregrounding app

[jkasten2]

Description

One Line Summary

Fixes a bug where tapping on a OneSignal notification on a Xiaomi device doesn't bring the app to the foreground.

Details

Xiaomi has very strict activity trampolining rules on notification open. We have to start the next activity before the current activity is finished.

Motivation

Xiaomi devices are commonly used so it is important notifications open behaves correctly.

Scope

Delays when the invisible activity is closed.

Related

• Fixes [Bug]: Xiaomi - Notification Open - Not foregrounding app (SDK 5) #2042
• Xiaomi's rules were originally discovered and documented in the Player Model PR [Change] Notification Activity Trampoline forward instead of reverse #1581.

Testing

Manual testing

Tested on Xiaomi Redmi 6A device with MIUI 11.0.8 (Android 9) as well as an Android 14 emulator with the following scenarios:

1. Background the app and tap on a notification
2. Swipe away the app and tap on a notification.
3. When the app is in the foreground tap on a notification
4. While the app is closed and the device is offline tap on a notification.

Affected code checklist

• Notifications
  • Display
  • Open
  • Push Processing
  • Confirm Deliveries
• Outcomes
• Sessions
• In-App Messaging
• REST API requests
• Public API changes

Checklist

Overview

• I have filled out all REQUIRED sections above
• PR does one thing
• Any Public API changes are explained in the PR details and conform to existing APIs

Testing

• I have included test coverage for these changes, or explained why they are not needed
  • An automated is tricky, it needs to be more of an integration style test, as should be a test resilient to refactors.
• All automated tests pass, or I explained why that is not possible
• I have personally tested this on my device, or explained why that is not possible

Final pass

• Code is as readable as possible.
• I have reviewed this PR myself, ensuring it meets each checklist item

---

This change is 

[nan-li]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @emawby, @jennantilla, @jinliu9508, and @shepherd-l)