units: add generic boot-complete.target
    
    (cherry picked from commit 329d20db3cb02d789473b8f7e4a59526fcbf5728)
    
    Resolves: #1872243
    
    patch_name: 0432-units-add-generic-boot-complete.target.patch
    present_in_specfile: true
    location_in_specfile: 432
    squash_commits: true