Fix Thread sync throwing exception sometimes crashing app

[jpelgrom]

Summary

Thread credential syncing uses the provided CoroutineScope to run other functions that throw exceptions. An user found an issue when not connected to their home network, this will throw an exception when getting the device credentials. Depending on where the function is called, this can crash the app.

When using a normal Job, like in the mainScope that we create in a few places, a thrown exception will mean that everything in that scope is cancelled and the exception propagates up, even if 'caught'. That isn't wanted so use a SupervisorJob instead, like the default viewModelScope, when running this function to make sure that when caught nothing else stops.

Screenshots

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Link to pull request in Documentation repository

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Any other notes

Easiest way to test is to access Home Assistant while only connected to mobile data and initiating a Thread credentials sync from the app settings.