Add a local dynamic config for ConnectivityManagerTest to decouple the test config from test logic.

Test: local runs, abtd
Bug: 317166695
(cherry picked from https://android-review.googlesource.com/q/commit:f4c16355dccccb6a81f32220d78f5eb8e06e0741)
Merged-In: I105650c4c9cb93e7da8cbe9aa68baa04d750a691
Change-Id: I105650c4c9cb93e7da8cbe9aa68baa04d750a691
verified in b/347657973.
3 files changed