Remove the allow_failure flag from metacoq CI.
Remove the allow_failure flag from metacoq CI.

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