fix(setup): decode complex config strings

[eliobischof]

The env variable ZITADEL_INTERNALAUTHZ_ROLEPERMISSIONMAPPINGS works for the start command but not for the setup command.

In the setup decoders, the complex string type is tried to be decoded AFTER the string is already split by comma into a slice of meaningless strings by the string list decoder.

With this PR...

• ...the decoding order is fixed for both the setup as well as the start decoders.
• ...the decoders order is the same for the start and setup commands
• ...the tests for the start config decoding are copied so they also run against the setup config decoders

The bug was reported on Discord.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.00%. Comparing base (9950caf) to head (cbb86d7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7854      +/-   ##
==========================================
+ Coverage   62.98%   63.00%   +0.02%     
==========================================
  Files        1333     1333              
  Lines      110076   110078       +2     
==========================================
+ Hits        69327    69360      +33     
+ Misses      36800    36772      -28     
+ Partials     3949     3946       -3     

Flag	Coverage Δ
core-integration-tests-postgres	63.00% <100.00%> (+0.02%)	⬆️

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[github-actions]

🎉 This PR is included in version 2.51.1 🎉

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