Display the origin opam repository when installing a package available in several repositories

[kit-ty-kate]

opam is able to deal with several opam repositories per switches. These repositories are ranked to able set an order to override packages from the other repositories below them.

ocaml/opam-repository#29247 shows that this behaviour can be quite confusing because the fact that package comes from one repository or another is hidden.

To remedy that i think we should at least show when installing/removing/upgrading/reinstalling/... the origin of packages that are present in more than one repository, similarly to what is done when installing a pinned package.

[rjbou]

Discussed in dev meeting: It is a good to have. The information is not directly available, it need to be reconstructed at the moment to display it.