Fix: Update onNotificationOpened to process each notification ID

[jennantilla]

Description

One Line Summary

Update onNotificationOpened to process each notification ID

Details

Motivation

After customer reports of dropping CTR following upgrade from v4 to v5, it was discovered that clicking an unexpanded group notification results in only registering the click result for the final notification in the group. This PR restores the SDK behavior back to "default" of registering clicks on a per-notification basis when the entire group is clicked.

Testing

Manual testing

Tested on a Pixel 7 (Android 14) emulator that clicking an uncollapsed group notification results in the click being tracked for each 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
  • If it is hard to explain how any codes changes are related to each other then it most likely needs to be more than one PR
• 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
• 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.
  • Simplify with less code, followed by splitting up code into well named functions and variables, followed by adding comments to the code.
• I have reviewed this PR myself, ensuring it meets each checklist item
  • WIP (Work In Progress) is ok, but explain what is still in progress and what you would like feedback on. Start the PR title with "WIP" to indicate this.

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This change is 

[jkasten2]

Logic itself looks correct, but there are some thing I would like to see cleaned up before merging so the code is more readable / doesn't misdirect.