Add support for epel9-next
    
    This modifies the assert_valid_epel_package function to check
    the CentOS Stream compose metadata to determine if a package name
    is valid for EPEL or not.  A similar change was made to fedscm-admin.
    
    JIRA: RHELCMP-6846
    Relates: https://pagure.io/fedscm-admin/pull-request/72
    Merges: https://pagure.io/fedpkg/pull-request/453
    
    Signed-off-by: Carl George <carl@george.computer>