opam install --no-lint

[kit-ty-kate]

Linting failures are superfluous in some contexts. It would be nice to avoid them being displayed.

[kit-ty-kate]

opam show already have an option already exactly named --no-lint (that of course does the same thing), so this would be for opam install etc. only then

[kit-ty-kate]

After discussion, #7118 would be nicer. But i'll keep this open until that ticket is fixed