Onboarding PR should show which version is it upgrading from

[Porkepix]

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Onboarding PR already shows a summary of what will be upgraded to which versions.
It'd be a good thing (especially if people want to plays around major/minor/patch versions) to show which version does it upgrade from.

Example, instead of update foo to version X.Z, show update foo from version x.y to version x.z