Allow using fix-mismatches to downgrade all, rather than upgrade all

[Nantris]

Description

This would be a big help for times when you have to git bisect and some third-party dependency is the issue. syncpack makes our lives so easy when we're moving forward, but when we have to go backwards it's a rough time.

Suggested Solution

A flag to always go to the lowest used version, rather than the highest, like syncpack fix-mismatches --to-lowest

Help Needed

Pointers to where this code is handled now and where such a feature's code would belong in the repo.

Alternative

Using Yarn's resolutions - but it's tedious to have to leave the command line during bisect.

Also, because we use syncpack in our postinstall step, when it throws an error it stops a command like yarn && yarn start with an error after yarn - which makes it tougher to use.

[JamieMason]

Thanks @slapbox, the idea of choosing from various strategies I think would be a good idea. It's quite a big job so might be a while but I'd like to see this too.

[JamieMason]

Released in 9.8.4.

Docs: https://jamiemason.github.io/syncpack/config/version-groups#preferversion-string

[Nantris]

Wow that was so fast! Thanks @JamieMason!

[JamieMason]

You're welcome, let me know if it works as expected