Hearing Aid: Connect route when right HA is connected first

Allow the hearings aid to properly connect to the audio route when the
right hearing aid is connected first.

Add some Unit tests to cover this case.

Bug: 308045084
Bug: 306075809
Test: atest TelecomUnitTests:com.android.server.telecom.tests.BluetoothRouteManagerTest
Test: manual tests with HAs
Test: manual tests with a Bluetooth speaker
Change-Id: I0e59a5f9d50ca69c36d7dad0fd7d9ef44a751829