Support JUnit @Order annotation for classes by default in profile aware class orderer

[holly-cummins]

When users don't specify an orderer, we should honor the @Order annotations. We also would need a test for this.

Best done after #34681 to avoid merge woes.

(Also a bit relevant to #42715.)

We currently use the ClassName class orderer:

       return Optional.ofNullable(getConfigParam(CFGKEY_SECONDARY_ORDERER, null, context))
                .map(fqcn -> {
                    try {
                        return (ClassOrderer) Class.forName(fqcn)
                                .getDeclaredConstructor()
                                .newInstance();
                    } catch (ReflectiveOperationException e) {
                        throw new IllegalArgumentException("Failed to instantiate " + fqcn, e);
                    }
                })
                .orElseGet(ClassOrderer.ClassName::new);

... but it should probably use the org.junit.jupiter.api.ClassOrderer$OrderAnnotation by default.

[holly-cummins]

Closing, because I've just checked the docs, and @Order is not yet a default for JUnit classes:

For example, for the @order annotation to be honored on test classes, you should configure the ClassOrderer.OrderAnnotation class orderer using the configuration parameter with the corresponding fully qualified class name (e.g., in src/test/resources/junit-platform.properties):