Add support for reading `net/data/ssl/certificates` files

* After supporting netty, the certificates files are needed to start up the HTTP server. Those files must be moved to the emulator which happens through the changes in AndroidTest.xml, isolated-storage
has been disabled to allow the emulator to access the storage freely without restriction. Otherwise
I will have to change the destination of the data files which will result in divergence.

* Added the newly introduced test utility java classes including netty to the `jarjar_excludes` as they must not be jarjared because they are not part of the bootclasspath.

Test: atest NetHttpTests
Bug: 319629150
Bug: 304217500
Change-Id: I2331873a9e178783319f889a377ba7e390ecdd6f
diff --git a/Cronet/tests/common/AndroidTest.xml b/Cronet/tests/common/AndroidTest.xml
index 33c3184..5fa7f74 100644
--- a/Cronet/tests/common/AndroidTest.xml
+++ b/Cronet/tests/common/AndroidTest.xml
@@ -19,6 +19,10 @@
         <option name="install-arg" value="-t" />
     </target_preparer>
     <option name="test-tag" value="NetHttpCoverageTests" />
+
+    <target_preparer class="com.android.tradefed.targetprep.PushFilePreparer">
+        <option name="push-file" key="net" value="/storage/emulated/0/chromium_tests_root/net" />
+    </target_preparer>
     <!-- Tethering/Connectivity is a SDK 30+ module -->
     <!-- TODO Switch back to Sdk30 when b/270049141 is fixed -->
     <object type="module_controller"
@@ -47,6 +51,7 @@
         <!-- b/316550794 -->
         <option name="exclude-filter" value="org.chromium.net.impl.CronetLoggerTest#testEngineCreation" />
         <option name="hidden-api-checks" value="false"/>
+        <option name="isolated-storage" value="false"/>
         <option
             name="device-listeners"
             value="com.android.modules.utils.testing.NativeCoverageHackInstrumentationListener" />