[connectivity] support specifying flags in TestableNetworkCallback

This is to allow specifying redaction flags in NetworkCallback for tests
which requires the location permissions. The change is not used in this
CL but its Child CL ag/34224157

Bug: 374037595
Flag: EXEMPT PURE_REFACTOR

Change-Id: I143f8877ec62ff50ce4073727aad24e252a2af66
1 file changed