Update greenwave rules for F35 EOL
    
    Thanks to @jforbes for reminding me of this - now F35 is EOL,
    we don't run the openQA upgrade tests on F36, so we have to
    upgrade the gating policy or no F35 updates can be pushed.
    Also drop other fedora-35 references in openQA-related rules.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>