[MS07.2] Move NetworkStatsCollection/IdentitySet into frameworks

These files are needed for the data migration util system Api
interfaces. Thus, they need to be moved into frameworks folder.

This change also set the @IgnoreUpTo annotation to S, since
these tests are testing purely platform code on S- devices which
is not really necessary for MTS. Also the tests are still covered
by the unit tests, since they are always verifying HEAD.

Test: TH
Bug: 197717846
Change-Id: I93c19b4860864c724be9f9f889ee2173f4605198
diff --git a/tests/unit/Android.bp b/tests/unit/Android.bp
index bd30b77..49037ee 100644
--- a/tests/unit/Android.bp
+++ b/tests/unit/Android.bp
@@ -69,8 +69,7 @@
         "java/android/net/IpSecTransformTest.java",
         "java/android/net/KeepalivePacketDataUtilTest.java",
         "java/android/net/NetworkIdentityTest.kt",
-        "java/android/net/NetworkStatsTest.java",
-        "java/android/net/NetworkStatsHistoryTest.java",
+        "java/android/net/NetworkStats*.java",
         "java/android/net/NetworkTemplateTest.kt",
         "java/android/net/TelephonyNetworkSpecifierTest.java",
         "java/android/net/VpnManagerTest.java",