core: transition to FINAL_SIGTERM state after ExecStopPost=
Fixes #14566
(cherry picked from commit c1566ef0d22ed786b9ecf4c476e53b8a91e67578)
Resolves: #1766479
patch_name: 0350-core-transition-to-FINAL_SIGTERM-state-after-ExecSto.patch
present_in_specfile: true
location_in_specfile: 350
squash_commits: true