Add test spec provider to test modules.

Provider added for the following test modules in this change: art_cc_test, cc_benchmark, cc_fuzz, cc_test, cc_test_host, rust_test,and rust_test_host.

Bug: 296873595
Test: Manual test
Change-Id: I815680529bcbecacb3a2bdb8f3746053afdee48c

cc/fuzz.go

@@ -96,6 +96,7 @@ func fuzzMutatorDeps(mctx android.TopDownMutatorContext) {
 // your device, or $ANDROID_PRODUCT_OUT/data/fuzz in your build tree.
 func LibFuzzFactory() android.Module {
 	module := NewFuzzer(android.HostAndDeviceSupported)
+	module.testModule = true
 	return module.Init()
 }