[SCIP] Copying SCIP with active pricers fails

[Alexander Helber]

Dear SCIP community,

I am working on a branch-and-price approach for a specific problem and 
wanted to add a simple heuristic which solves the same problem with some 
variables fixed. I implemented the copying callbacks for my problem data 
and pricer, but now face the problem that `SCIPcopy` throws an exception 
due to the SCIP copy being in the wrong stage.

The SCIP copy is a freshly created instance and therefore the INIT 
stage, as expected by `SCIPcopy` (see `scip_copy:2888` in SCIP 8.0.2). 
But then the pricers are added and activated (`set.c:911`), which is 
only possible in the PROBLEM stage (`scip_pricer.c:380`). I can not find 
a use of `SCIPcopy` with pricing enabled in the codebase of the SCIP 
Optimization Suite, so it is unclear to me if I should do something 
different here. I would greatly appreciate your help.

All the best
Alex
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