sort allowlists by version more consistently

[tungol]

This makes it easier to ensure that categorization and comments are in sync between one allowlist and another.

With the help of a quick script, I sorted the version-specific allowlists and made sure that comments and fix/don't fix is consistent between the files. Each labeled section is identical to others with the same name, and this should also make consolidating when dropping an old version easier.

On the negative side, this is unfortunately sure to cause a lot of merge conflicts. What do people think? Worth it or not worth it?

There should be no significant differences in overall content in this MR. I did consolidate some comments to an inline version, and there was one entry which had been commented out in all the files where it appeared:

# typing.SupportsRound.__round__ # pos-or-kw at runtime, but we pretend it's pos-only in the stub so that e.g. float.__round__ satisfies the interface

I'm not sure why it was commented out but not removed; I did remove it as part of this MR. Edit: looks like it's from #7442

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉

[srittau]

Thanks!