Make the qa build debuggable (#3675)

Make the qa build debuggable, just as the devel and debug already are,
so that you can pull output/test files off the device without needing
debug-keys or rooted devices.

b/0nobugforlinter

starboard/android/apk/app/build.gradle

@@ -122,6 +122,8 @@ android {
             enableUnitTestCoverage true
         }
         qa {
+            debuggable true
+            jniDebuggable true
             externalNativeBuild {
                 cmake.arguments "-DCOBALT_CONFIG=qa"
             }