Bugreport sharing is now work profile aware

Now we look at work profile too, if available, when looking for a preferred
email address.

TODO: The chooser activity should default to work profile too, but it seems
to require a lot more work, so not done yet.

Test: manual tests
Test: adb shell am instrument -w -e class com.android.shell.BugreportProgressServiceTest com.android.shell.tests

Bug 30865666

Change-Id: I9b4776d53455a23bfdc4960da25e98bd1dc1b2a1