[release] should not check (all) links

[blueyed]

tox -e release -- … triggers the link checking, which is very slow.

This should only be done on demand I think.

There's an option to skip it: https://github.com/blueyed/pytest/blob/059bf16d09dde7720876fae67a1f096b401137ac/scripts/release.py#L118

[nicoddemus]

I was a bit concerned about this as well, but after making the release a few times I don't really seem to notice (takes less than 3 minutes or so).

[The-Compiler]

FWIW we've already had this discussion in #1722.

If only doing it on demand, I bet nobody will ever do it 😉 Like @nicoddemus said, if it's not a problem when releasing in practice, I don't see why it should be removed.