Show a spinner when waiting for the work profile to turn on.

This covers the usecase when we show the share sheet or
intent resolver on a device with a work profile, and
the work profile is turned off. In that case, when
sharing from the personal profile, we show an empty
state screen with the option to turn on the work profile.
When we tap that button, we now show a spinner, as there
is a delay until the profile is actually enabled.

Fixes: 149821684
Test: manual

Change-Id: Id90b21a61b10ecce8172bddc42fdeec5fb61c5fe