fix(frontends/lean/tactic_notation): do not store position information for auxiliary terms introduced by the interactive mode
fix(frontends/lean/tactic_notation): do not store position information for auxiliary terms introduced by the interactive mode

The idea is to prevent unwanted type information at lean-mode.
For example, before this commit, we would get "list.nil : ..." type
info whenever we hovered over the "end" of a "begin...end" block.

rlewis1988/lean,leodemoura/lean,digama0/lean,dselsam/lean,fgdorais/lean,Kha/lean,johoelzl/lean,dselsam/lean,fpvandoorn/lean,leodemoura/lean,leodemoura/lean,leanprover-community/lean,digama0/lean,avigad/lean,leanprover-community/lean,fpvandoorn/lean,leanprover/lean,leanprover-community/lean,fgdorais/lean,Kha/lean,Kha/lean,fpvandoorn/lean,fgdorais/lean,leanprover-community/lean,leodemoura/lean,leodemoura/lean,johoelzl/lean,leanprover-community/lean,leodemoura/lean,digama0/lean,dselsam/lean,digama0/lean,avigad/lean,fgdorais/lean,avigad/lean,avigad/lean,johoelzl/lean,Kha/lean,fpvandoorn/lean,leanprover/lean,rlewis1988/lean,fgdorais/lean,Kha/lean,rlewis1988/lean,fpvandoorn/lean,dselsam/lean,fgdorais/lean,digama0/lean,dselsam/lean,Kha/lean,leanprover/lean,rlewis1988/lean,avigad/lean,johoelzl/lean,avigad/lean,leanprover-community/lean,leanprover/lean,leanprover/lean,digama0/lean,rlewis1988/lean,rlewis1988/lean,leanprover/lean,dselsam/lean,fpvandoorn/lean,johoelzl/lean,johoelzl/lean