[3.x.x] Replace deprecated openURL method preventing launch URLs

[nan-li]

Description

One Line Summary

The method openURL: (doc) appears to be completely deprecated on ios 18, so replace with the updated openURL:options:completionHandler: (doc).

Details

Motivation

Tapping on launch URLs fails with iOS 18 when using the deprecated method.
The user model SDK already uses the newer API.

Scope

Update a deprecated method with its replacement in 2 places (both are tested).

Testing

Unit testing

None

Manual testing

iPhone 16 simulator on iOS 18.0

• Reproduced the issue that the method is no-op
• Works after updating the method
• Tested both changes

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
• 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

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This change is 

[nan-li]

The CI environment may have changed. Ran this CI 3 times, all had some tests failing after 10-11 minutes. Passes locally.
The last 2 PRs ran around 3-4 minutes, all passing.