ISPN-13905 removed the modular jdk logic from bin/common.sh, however the JVM GC logic was not updated to reflect this. The current logic relies on the removed MODULAR_JDK env variable, consequently the wrong GC settings are assigned to TMP_PARAM and the subsequent java call fails, preventing TMP_PARAM being appended to PREPEND_JAVA_OPTS.

As java 11 and 17 support the same GC flags, we can remove all of the version specific GC logic and simply add the GC args to PREPEND_JAVA_OPTS directly.