Disable notifications from clone-tag by default
    
    The tagBuildBypass and untagBuildBypass invocations in the clone-tag
    CLI were not setting the notify option, leaving it at the default of
    True. This means in some cases many hundreds of notification events
    would be triggered from a clone-tag call.
    
    Change the default behavior of clone-tag to explicitly disable
    notifications
    
    Add a new --notify option to clone-tag to re-enable notifications for
    tagging and untagging of builds.
    
    Fixes: #1890