Fix logout() when push subscription doesn't exists

[jkasten2]

Description

One-Line Summary

Fix OneSignal.logout() so it doesn't throw an error if there isn't a push subscription.

Details

A push subscription only exists if the end-user accepted notifications at some point. OneSignal.logout() made this bad assumption it always existed.

The fix is to check this and create a local only user instead of making a call to OneSignal if there isn't a push subscription.

Validation

Tests

Tested on Chrome Version 128.0.6613.138 on Windows 11 23H2
Scenarios:

1. OneSignal.login("A");
2. OneSignal.User.addEmail("[email protected]");
3. OneSignal.logout();
4. OneSignal.User.addEmail("[email protected]");
5. Observe [email protected] was added to the correct User.

Info

Checklist

• All the automated tests pass or I explained why that is not possible
• I have personally tested this on my machine or explained why that is not possible
• I have included test coverage for these changes or explained why they are not needed
  • No current login / logout tests, there is another project to add test coverage to this flow.

Programming Checklist
Interfaces:

• Don't use default export
• New interfaces are in model files

Functions:

• Don't use default export
• All function signatures have return types
• Helpers should not access any data but rather be given the data to operate on.

Typescript:

• No Typescript warnings
• Avoid silencing null/undefined warnings with the exclamation point

Other:

• Iteration: refrain from using elem of array syntax. Prefer forEach or use map
• Avoid using global OneSignal accessor for context if possible. Instead, we can pass it to function/constructor so that we don't call OneSignal.context

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Related Tickets

• [Bug]: Trying to logout gives error onesignal-vue3#43
• [Bug]: Login: No identity model found react-onesignal#140

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This change is 

[shepherd-l]

Tested on Chrome Version 128.0.6613.138 on macOS Sonoma 14.6.1 with the web example app

Steps:

1. Clear web cache
2. Open example web app and do not accept the push notification permission (inorder to not create a push sub)
3. OneSignal.login("TestUser");
4. OneSignal.logout();

This PR does not produce an error
Reproduced error on main:

Dev-OneSignalSDK.page.es6.js?v=160202:2072 Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'modelId')  
    at OSModelStore.subscribeUpdateListener (Dev-OneSignalSDK.page.es6.js?v=160202:2072:41)  
    at OSModelStore.add (Dev-OneSignalSDK.page.es6.js?v=160202:2056:14)  
    at CoreModuleDirector.add (Dev-OneSignalSDK.page.es6.js?v=160202:915:32)  
    at LoginManager.<anonymous> (Dev-OneSignalSDK.page.es6.js?v=160202:6476:87)  
    at Generator.next (<anonymous>)  
    at fulfilled (Dev-OneSignalSDK.page.es6.js?v=160202:18277:58)

Reviewable status: 0 of 1 files reviewed, all discussions resolved (waiting on @emawby and @rgomezp)