Fix activating [sources] with relative paths

[mortenpi]

So.. a very rough attempt to fix #92. Basically, the idea is to just loop over the source Project.toml and replace the relative paths with absolute paths, before it gets resolved.

Seems to work, but I really don't follow the code well enough to know if it's in the right place. Or even the right solution.

cc @KristofferC, should you have any bandwith to take a look at this.

[oscardssmith]

I just ran into this as well. It would be great if we could get this in.

[KristofferC]

LGTM, there is also https://github.com/JuliaLang/Pkg.jl/blob/8f013c7652fd4fbbe044176a585ed0326a703338/src/Operations.jl#L2084-L2100 if you want to use that.

[oxinabox]

If @KristofferC says it is good then that is enough for me.
Do you have merge rights on this repo @KristofferC ?
you should given it is mostly hacked up version of code you wrote

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 50.00%. Comparing base (b652737) to head (6496f33).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/julia-1.11/activate_set.jl	0.00%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #93       +/-   ##
===========================================
+ Coverage   20.66%   50.00%   +29.33%     
===========================================
  Files          27       28        +1     
  Lines         692      716       +24     
===========================================
+ Hits          143      358      +215     
+ Misses        549      358      -191     

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