Update release notes for shenandoah-8u392-b01.
Sync the copy of the portable specfile with the latest update
Update generate_tarball.sh to be closer to upstream vanilla script inc. no more ECC removal
Update bug URL for RHEL to point to the Red Hat customer portal
Change top_level_dir_name to use the VCS tag, matching new upstream release style tarball
Related: RHEL-12209
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
Resolves: rhbz#2083322
