[Thread] grant the NEARBY_WIFI_DEVICES permission to Thread tests

Fix forward for b/405297285

Background: new / existing runtime permission is now used to guard
access to local networks. apps / tests now need to hold this permission
to do traffic with local devices.

Test: atest ThreadNetworkIntegrationTests
Bug: 405297285
Change-Id: I31aaf147a9f9bd8fab7640b935a163405d31e2b9
2 files changed