Remove mypy run implicit option temporarily implemented in PR 1790 after PR 1769 gets merged

[valeriupredoi]

mypy command line opts put in in #1790 but after #1769 gets merged it needs to be removed 🐳

[valeriupredoi]

we are not going the pin way, instead we are setting some command args to mypy in #1790

[schlunma]

But I think we still should remove the option implicit_optional again after #1769.

[valeriupredoi]

indeed, good point, Manu! I renamed/redescribed and reopned, I hope I don't get rebuffed 😆