Update release notes for shenandoah-8u342-b06.
Switch to EA mode for 8u342 pre-release builds.
Print release file during build, which should now include a correct SOURCE value from .src-rev
Update tarball script with IcedTea GitHub URL and .src-rev generation
Use "git apply" with patches in the tarball script to allow binary diffs
Remove redundant "REPOS" variable from tarball script
Include script to generate bug list for release notes
Update tzdata requirement to 2022a to match JDK-8283350
