[Testing] Use AndroidJUnit4 instead in telephony/gsm/ test files

1. Use AndroidJunit4 instead of RobolectricTestRunner
2. Use ApplicationProvider instead of RuntimeEnvironment to get context
3. Change Copy Right
4. Workaround the resource getString to resolve the resource not found

Bug:
Test: atest -c AutoSelectPreferenceControllerTest
      atest -c OpenNetworkSelectPagePreferenceControllerTest
Change-Id: Ic80da4fcc6a64e7fde55705dda128741c26ce3cf