Gazelle: Have way to turn off the `java_binary` generation in the java tests area

[tjoneslo]

This is an odd edge case from a client using a great number of GRPC services, and then trying to write tests around them. The general form of the test is:

public class ApplicationTest {

    @Test
    public void testLifecycle() throws Exception {
        final TestApplication application = new TestApplication();
         application.start();
         application.stop();
        // Test using application here. 
    }

    public static class TestApplication extends RealApplication {
        public static void main(String[] args) throws Exception {
            main(TestApplication.class, args);
        }
    }
}

When run through gazelle, it generates both a java_test_suite for the ApplicationTest and a java_binary for the ApplicationTest.TestApplication. I would like to be able to turn off the latter.

[tjoneslo]

When generated the java_binary comes out as:

java_binary(
    name = "ApplicationTest.TestApplication",
    main_class = "com.example.ApplicationTest.TestApplication",
    visibility = ["//visibility:public"],
    runtime_deps = [
        ":application",
    ],
)

which generates the following error message:

in runtime_deps attribute of java_binary rule //src/test/com/example/application:ApplicationTest.TestApplication: test_suite rule '//src/test/com/com/example/application:application' is misplaced here (expected cc_binary, cc_library, genrule, genproto, java_import, java_library, java_proto_library, java_lite_proto_library, proto_library, sh_binary or sh_library) and '//src/test/com/example/application:application' does not have mandatory providers: 'CcInfo' or 'JavaInfo'. Since this rule was created by the macro 'java_binary', the error might have been caused by the macro implementation.

The correct runtime_deps should be ":application-test-lib".