DO NOT MERGE: Delete the last remaining user of TestNetworkStackLib.

FrameworksNetIntegrationTests is the last user of this target.
It is not really necessary since it can trivially be replaced by
NetworkStackApiStableLib.

Bug: 167645754
Test: atest FrameworksNetIntegrationTests
Ignore-AOSP-First: change is already in AOSP
Change-Id: Id5e8eb3f58590f4b3cfbcbef66b00acbba77a7a7

tests/net/integration/Android.bp

@@ -26,7 +26,7 @@ android_test {
         "android.test.mock",
     ],
     static_libs: [
-        "TestNetworkStackLib",
+        "NetworkStackApiStableLib",
         "androidx.test.ext.junit",
         "frameworks-net-integration-testutils",
         "kotlin-reflect",