[CS01]Remove hidden API usage of NetworkCapabilities

The connection service will become the mainline module. The mutable
NetworkCapabilities is deprecated, and the NetworkCapabilities should
be built through their Builder instead.

Bug: 170598012
Test: atest FrameworksNetTests
Test: atest IpConnectivityMetricsTest
Change-Id: I73a4d3a7c118b9cef037ed52efb96ed123da2fa5