Revert "Skip TestDropPacketToVpnAddress if the feature is disabled"

This reverts commit 41ce7c550cce438c326c2fee00fdab5b04ff9611.

Reason for revert: fails on V release builds which lack isConnectivityServiceFeatureEnabledForTesting

Bug: 369230467
Change-Id: I55f7fb329fbdfa6dda05bc6857a3d66c593ca44a
Test: test-only change
4 files changed