[Bug]: Dial back version conflict warnings

[shilman]

Describe the bug

As part of a migration we now warn users about duplicate package versions #21791

However, this warning is overly aggressive and fires almost any time the user uses fixed versions of packages.

This is because:

1. the fixed versions depend on fixed versions of SB packages inside the monorepo
2. the fixed versions depend on version ranges of SB packages outside the monorepo
3. the SB packages outside the monorepo depend on version ranges in the monorepo

Until we figure out a proper solution, we should dial back the warning to only warn if the minor versions are different (e.g. if you're running 7.1 + 7.0 together, 7.0 + 6.5, etc.)

To Reproduce

See mealdrop https://github.com/yannbf/mealdrop

System

No response

Additional context

No response

[shilman]

Yo-ho-ho!! I just released https://github.com/storybookjs/storybook/releases/tag/v7.0.0-rc.11 containing PR #21850 that references this issue. Upgrade today to the @next NPM tag to try it out!

npx sb@next upgrade --prerelease