[compat] Remove "Tactic Pattern Unification"
[compat] Remove "Tactic Pattern Unification"

Following up on #6791, we remove the option "Tactic Pattern Unification"

gares/coq,coq/coq,silene/coq,ejgallego/coq,silene/coq,maximedenes/coq,JasonGross/coq,letouzey/coq-wip,JasonGross/coq,Zimmi48/coq,letouzey/coq-wip,letouzey/coq-wip,SkySkimmer/coq,ppedrot/coq,gares/coq,Zimmi48/coq,gares/coq,letouzey/coq-wip,Matafou/coq,coq/coq,ppedrot/coq,maximedenes/coq,ppedrot/coq,ejgallego/coq,JasonGross/coq,maximedenes/coq,silene/coq,maximedenes/coq,ppedrot/coq,coq/coq,JasonGross/coq,maximedenes/coq,SkySkimmer/coq,letouzey/coq-wip,ppedrot/coq,SkySkimmer/coq,ejgallego/coq,Matafou/coq,Zimmi48/coq,SkySkimmer/coq,Zimmi48/coq,gares/coq,ejgallego/coq,coq/coq,gares/coq,Matafou/coq