Stop building classes with Java 7 byte code #33569
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Liberty has not supported Java 7 for 6 years. Update to no longer create Java 7 byte code for classes used for interop with other frameworks like the ejbportable classes, or to give out a nice message if someone uses Java 7 byte code.
This changes allows us to build with Java 21 or higher with all projects instead of having to use Java 17 for most projects and only Java 21 for the Java 21 specific projects.
I have considered the risk of behavior change or other zero migration impact (https://github.com/OpenLiberty/open-liberty/wiki/Behavior-Changes).
If this PR fixes an Issue, the description includes "Fixes #FILLMEIN" or "Resolves #FILLMEIN" (verify
release buglabel if applicable: https://github.com/OpenLiberty/open-liberty/wiki/Open-Liberty-Conventions).If this PR resolves an external Known Issue (including APARS), the description includes "Fixes #FILLMEIN" or "Resolves #FILLMEIN".