Partial cherry-pick to remove IoUtils#deleteContents usage in FrameworksNetTests

It's a partial cherry-pick of https://r.android.com/1731232

Bug: 154796679
eest: atest ConnectivityCoverageTests
Merged-In: I5366e1cc9cd6ddb41f24718246381cc2b1cc1383
Change-Id: I23565c4144e665130585a86ce66cee6c2da07b60
diff --git a/tests/unit/Android.bp b/tests/unit/Android.bp
index beae0cf..909a192 100644
--- a/tests/unit/Android.bp
+++ b/tests/unit/Android.bp
@@ -65,6 +65,7 @@
     static_libs: [
         "androidx.test.rules",
         "bouncycastle-repackaged-unbundled",
+        "core-tests-support",
         "FrameworksNetCommonTests",
         "frameworks-base-testutils",
         "frameworks-net-integration-testutils",