we are sending a task within a task for common worker which cause the
async behavior, remove the re-submitting task for report finalization

Avoid `Task`s in `checkForPreviousCrash`. This is a step towards
removing the nasty `awaitEvenIfOnMainThread`.

Deprecate `awaitEvenIfOnMain`. Next PR will be to drain the worker and
remove this util.

Adjust time out and disk worker as discussed. This moves some things off
the disk worker, but we plan to put them back after more refactoring.

Make init suspend on settings only, not on race. This allows us to avoid
having a separate queue just for init and settings.

If the app has unsent reports, but data collection and send unsent
reports both have not been triggered, still let user actions queue up.

Add a precondition check for not main thread. This is more useful when
we just want to enforce not main thread, not a specific thread.

Make doBackgroundInitializationAsync submit a callable instead of submit
task

Submit task results in a blocking behaviour when `SettingsTask` cannot
be resolved during initialization
Remove un-necessary task return