Make plugin updates minor only by default

[janhenckens]

When running craft update all, the system will list all available updates, including ones to a new major version. That can have adverse effects, as major updates can contain breaking changes and the update process doesn't have a way to surface those.

It's up to the users to check what they're updating but when for example we can't upgrade to new major version of a plugin because it breaks a usage case we need, craft update all will keep listing it.

Passing --minorOnly helps, but maybe --includeMajor makes more sense?

Practical example is Formie 4, which includes new classes in the out of the box templates, which causes all our extra form styling to be broken.