Separate test groups into different files based on JDK_VERSION

In https://github.com/adoptium/aqa-tests/blob/master/jck/jck.mk, we have test groups per JDK_VERSION. This makes jck.mk very long and hard to review, compare and maintain. For example, PR https://github.com/adoptium/aqa-tests/pull/4454

I would like to suggest separating test groups into different files based on JDK_VERSION. For example, create a `testGroup` folder. In the `testGroup` folder, we can have test group file for each version (i.e., jdk8.mk, jdk11.mk, jdk17.mk, etc). These test group make files can be included based on the current JDK_VERSION. Similar to the files in https://github.com/adoptium/aqa-tests/tree/master/openjdk/excludes

@smlambert @Mesbah-Alam what's your recommendation on this? I am open to other suggestions.