Disable all filegroups in mixed builds

Rather than individually denylisting filegroups until we prioritize a
solution for mixed builds that will correctly integrate into uses such
as proto, aidl, gensrcs, etc.

Test: mixed_droid
Change-Id: Iddbd391af7dd7cabc892b2b26dbc68e3aa506471

java/java_test.go

@@ -1288,6 +1288,8 @@ func TestAidlExportIncludeDirsFromImports(t *testing.T) {
 }
 
 func TestAidlIncludeDirFromConvertedFileGroupWithPathPropInMixedBuilds(t *testing.T) {
+	// TODO(b/247782695), TODO(b/242847534) Fix mixed builds for filegroups
+	t.Skip("Re-enable once filegroups are corrected for mixed builds")
 	bp := `
 	filegroup {
 		name: "foo_aidl",