Bench zulip bot: fix PR title handling
Bench zulip bot: fix PR title handling

The bot post creation is moved before we `git checkout $new_coq_commit`

JasonGross/coq,SkySkimmer/coq,coq/coq,Zimmi48/coq,JasonGross/coq,coq/coq,ejgallego/coq,SkySkimmer/coq,Zimmi48/coq,ejgallego/coq,ejgallego/coq,SkySkimmer/coq,Zimmi48/coq,JasonGross/coq,coq/coq,SkySkimmer/coq,Zimmi48/coq,ejgallego/coq,JasonGross/coq,coq/coq