Fix Connect State message in Device details for Hearing Aids

In the Device details of Settings App and when using two Hearing Aids
devices (left and right sides), this will fix the summary messages
for these two devices. Previously, the connect state of the summary
messages are inconsistent and does not always update. This CL will
always make sure that both side devices are refreshed at the same time
and also make sure that we get the summary messages of both sides.
Also added Robo tests for the changes.

Test: Manual tests and also ran RunSettingsLibRoboTests and RunSettingsRoboTests.
Bug: 117074814
Bug: 116317072
Change-Id: Ia9df6facd99ae91ebb4a819f61ea27551ce35efe
Merged-In: Id2dc364dfa815e72db91b92bcee9745e6c40d34a
Merged-In: Ia9df6facd99ae91ebb4a819f61ea27551ce35efe