Fix attrs import error on EPEL9
    
    - Resolves: rhbz#2182954
    - Enforce tests
    
    Previously failing tests were ignored, which resulted in an EPEL 9 build
    being released that was non-functional.  This change adds a patch to fix
    compatibility with RHEL9's attrs package.  It also adds other patches
    based on upstream commits to fix some test failures.  A handful of tests
    had to be skipped for various reasons (see comments) in order to get the
    overall suite to run.  But now that it runs, we can enforce the tests
    and fail the build if something unexpected fails.