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Guest profiles are not added to profile attribute storage since they are
only stored in memory. But we need to add ephemeral Guest profiles to
the storage (similar to ephemeral profiles) so that after a crash, they
would be found and deleted.
This CL adds IsGuest to ProfileAttributeStorage to keep track of
ephemeral Guest profiles and updates related metrics tests.

Please see go/ephemeral-guest-profiles for more context.

Bug: 1125474
Change-Id: I5f169cc7c5757368303bfbdb1abf78563692e248
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2523111
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827229}