Merge "implement Thread Border Router e2e integration test" into main

Tethering/common/TetheringLib/Android.bp

framework-t/Android.bp

framework/Android.bp

staticlibs/device/com/android/net/module/util/Ipv6Utils.java

thread/TEST_MAPPING

thread/tests/integration/Android.bp

thread/tests/integration/AndroidManifest.xml

...integration/src/android/net/thread/BorderRoutingTest.java

.../integration/src/android/net/thread/FullThreadDevice.java

...ntegration/src/android/net/thread/InfraNetworkDevice.java

...egration/src/android/net/thread/IntegrationTestUtils.java