core: make log messages about units entering a 'failed' state recognizable
    
    Let's make this recognizable, and carry result information in a
    structure fashion.
    
    (cherry picked from commit 7c047d7443347c109daf67023a01c118b5f361eb)
    
    Related: #1737283
    
    patch_name: 0379-core-make-log-messages-about-units-entering-a-failed.patch
    present_in_specfile: true
    location_in_specfile: 379
    squash_commits: true