bug#74556: 30.0.92; Package upgrade can fail and results in deleted package

[Eli Zaretskii]

> Cc: 74556@debbugs.gnu.org
> From: Philip Kaludercic <philipk@posteo.net>
> Date: Thu, 28 Nov 2024 11:34:51 +0000
> 
> Philip Kaludercic <philipk@posteo.net> writes:
> 
> [...]
> 
> > It might make sense to try and "deactivate" a package before installing
> > the new package.  Looking into some second-try fallback for
> > package-install to refresh the package index if a package was not found
> > would also be a good idea ^^
> 
> This might do it?

Philip, please install this on the emacs-30 branch, unless you see any
problems with the change.  We'd like to make another pretest soon.