Use goAsync to invoke the WebSocketManager.start

[TimoPtr]

Summary

The call to WebSocketManager.start can be a bit slow since it needs to cancel previous job and send await. We should do that using goAsync to let know the system that it is still alive.

(last 7 days)

It seems to be mostly on old devices (bellow Android 12)

Checklist

• New or updated tests have been added to cover the changes following the testing guidelines.
• The code follows the project's code style and best_practices.
• The changes have been thoroughly tested, and edge cases have been considered.
• Changes are backward compatible whenever feasible. Any breaking changes are documented in the changelog for users and/or in the code for developers depending on the relevance.

Any other notes

Based on #6467