Add Cts for ConnectionService focus API

Bug: 69651192
Test: atest CtsTelecomTestCases:ConnectionServiceTest
Merged-In: Iff82f87b4c61abd3f53150f35e879cfc439b85ed
Change-Id: Iff82f87b4c61abd3f53150f35e879cfc439b85ed
5 files changed