Support complete_remote_package!

[fonsp]

Fix #3178

This also removes the assumption that REPLMode.complete_remote_package is defined, which caused the precomp failure

Try this Pull Request!

Open Julia and type:

julia> import Pkg
julia> Pkg.activate(temp=true)
julia> Pkg.add(url="https://github.com/fonsp/Pluto.jl", rev="pkg-complete_remote_package-1.11")
julia> using Pluto

[fonsp]

Julia 1.12 tests are failing because of #3175

But I don't think we can test this on CI yet, the 1.11 and 1.12 Pkg versions are not yet (pre)released.

[danielwe]

With 1.11.5 now released, this is needed for precompilation to succeed and Pluto to work

[danielwe]

I suppose it would also be good to submit a PR to the registry to cap the Julia compat of existing Pluto releases at 1.11.4? At least for every release since 0.15, which was the first that included #844

[PatrickHaecker]

I second to act quickly here. Currently, we violate the users assumption that stable updates are stable. Telling everyone to just do

(@v1.11) pkg> add Pluto#pkg-complete_remote_package-1.11

is possible, but not very user friendly and will hunt us in the future when they stay on this branch.

[fonsp]

Required one more fix in 5619f89

releasing after CI

[PatrickHaecker]

Thanks a lot for doing a release so quickly today!

[fonsp]

Fixes #3191 and #3190