Modify device status browser tests to use the non mojom App struct.

This CL is used to prepare for CL:3547984 to enable the
AppServiceOnAppUpdateWithoutMojom flag.

Modify DeviceStatusCollectorTest and LegacyDeviceStatusCollectorTest to
use the non mojom Apps, to support the AppServiceOnAppUpdateWithoutMojom
flag flip.

Device status browser tests assumes no default apps added. With mojom
AppService, it's ok since those default apps are added via mojom async.
However, with non mojom AppService, those default apps are added sync,
which could affect the test results. So add scoped omit test classes to
skip those default apps.

This CL is pure refactor, and no function change.

BUG=1253250

Change-Id: If3877e036ecc06ef5a2160d93453acfe00ff257a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3552282
Reviewed-by: Anqing Zhao <anqing@chromium.org>
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/main@{#985860}