Make ThreadNetworkController.setTestNetworkAsUpstream require NETWORK_SETTINGS permission

This CL contains following enhancements:

- Enforce NETWORK_SETTINGS permission for ThreadNetworkController.setTestNetworkAsUpstream.
- Move the setTestNetworkAsUpstream in
  ThreadNetworkControllerService to make the order of methods more
logical.
- Update the test case name in BorderRoutingTest.

Bug: 295843010
Bug: 320842152

Change-Id: I82edac6c819dd637f4c98f31368a1b520338ce24