At present, Hazelcast configurations used in tests disable multicast join but leave network join auto-detection enabled. This can cause issues with parallel test execution on machines that have bigger number of CPU cores/threads.
This commit updates Hazelcast configurations used in tests to disable network join auto-detection and thus ensure no network join method ends up being enabled.
Remove code that is not necessary to demonstrate Spring Session functionality and is not compatible with the Java 17 / Jakarta EE 9 upgrades.
Issue gh-1949