Add soong.java.testProperties to java_defaults module type.

This is so that we can use some test properties in a `java_defaults`
module for ART run-tests.

Test: atest art-run-test-001-HelloWorld
Bug: 147814778
Change-Id: Ifb9817ca2f08e64f911c123a4022fbf688405547

java/java.go

@@ -2903,6 +2903,7 @@ func DefaultsFactory() android.Module {
 		&appProperties{},
 		&appTestProperties{},
 		&overridableAppProperties{},
+		&testProperties{},
 		&ImportProperties{},
 		&AARImportProperties{},
 		&sdkLibraryProperties{},