[FEATURE] Experimental 'Change branch' dialog could report what branch checking out and which one we're migrating away from

[luzpaz]

Is your feature request related to a problem? Please describe. The experimental 'change branch' functionality could be a little more UX friendly by letting us know what it specifically did

Describe the solution you'd like

Branch change succeeded
Moved from <branch> to <new_branch>
Please restart to use the new version

Additional context

https://github.com/FreeCAD/FreeCAD/blob/c2055689a593347c507101e9daf31be760abd2a9/src/Mod/AddonManager/package_details.py#L644