[JS02]Remove hidden API usage of NetworkRequest.networkCapabilities

The connection service will become the mainline module.
Therefore, remove the caller of using NetworkRequest's
hidden API outside the module.

Bug: 170598012
Test: atest ConnectivityControllerTest
Test: atest CtsJobSchedulerTestCases
Change-Id: I263d2488472dae21e1cdca3760e0127cc0d20de2
Merged-In: I263d2488472dae21e1cdca3760e0127cc0d20de2