[JS01]Remove hidden API usage of Connectivity Sevice

The Connectivity service will become the mainline module.
Therefore, remove the caller of using Connectivity's
hidden API outside the module and expose the required
connectivity API used in Jobscheduler.

Bug: 183456204
CTS-Coverage-Bug: 170598012
Test: atest JobStoreTest
Change-Id: Ie6bc81ff382fb242b98f35d28a96defc207c7987