Add NetHttpCoverageTests to mainline presubmit

Mainline presubmit runs on older images. So we need to set:
- min_sdk_version to the minimum sdk we support otherwise
it would default to current
- enforce_default_target_sdk_version since mainline needs
all modules to target the latest sdk

Test: presubmit
Bug: 263294440
Change-Id: I20757b13ab9ab45908dae088c6cb6b0bbc51989d
diff --git a/Cronet/tests/common/AndroidManifest.xml b/Cronet/tests/common/AndroidManifest.xml
index efe880c..b00fc90 100644
--- a/Cronet/tests/common/AndroidManifest.xml
+++ b/Cronet/tests/common/AndroidManifest.xml
@@ -18,6 +18,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
           xmlns:tools="http://schemas.android.com/tools"
           package="com.android.net.http.tests.coverage">
+
     <!-- NetHttpCoverageTests combines CtsNetHttpTestCases and NetHttpTests targets,
      so permissions and others are declared in their respective manifests -->
     <application tools:replace="android:label"