path: stop watching path specs once we triggered the target unit
    
    We start watching them again once we get a notification that triggered
    unit entered inactive or failed state.
    
    Fixes: #10503
    (cherry picked from commit 8fca6944c2ee20c63d62154c8badddc77170b176)
    
    Resolves: #1763161
    
    patch_name: 0235-path-stop-watching-path-specs-once-we-triggered-the-.patch
    present_in_specfile: true
    location_in_specfile: 235
    squash_commits: true