Pass NetworkCapabilities into DnsManager

1. At present, the transportTypes in NetworkCapabilities have been
passed into DnsManager::updateTransportsForNetwork() as a parameter. In
the following CL, we also need to pass the 'metered' (also in
NetworkCapabilities) as a parameter to the function. Instead of passing
the members of NetworkCapabilities one by one, it is better to pass the
entire NetworkCapabilities.

2. Rename updateTransportsForNetwork() to
updateCapabilitiesForNetwork().

Bug: 288340533
Test: presubmit
Change-Id: I0966124f87b12c1d5a2eaee681885c3d5c7f74dc