support contactpersoonRol attributes for ZGW backend

[annashamray]

[skip: e2e]
Closes #5984

Changes

• add 3 contactpersoonRol attribute mappings
• document how to configure it

Checklist

Check off the items that are completed or not relevant.

• Impact on features

  • Checked copying a form
  • Checked import/export of a form
  • Config checks in the configuration overview admin page
  • Checked new model fields are usable in the admin
  • Problem detection in the admin email digest is handled

• Dockerfile/scripts

  • Updated the Dockerfile with the necessary scripts from the ./bin folder

• Commit hygiene

  • Commit messages refer to the relevant Github issue
  • Commit messages explain the "why" of change, not the how

• Documentation

  • Added documentation which describes the changes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.10%. Comparing base (73a5129) to head (40633db).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6308      +/-   ##
==========================================
- Coverage   97.10%   97.10%   -0.01%     
==========================================
  Files         868      868              
  Lines       33117    33119       +2     
  Branches     3045     3046       +1     
==========================================
  Hits        32159    32159              
- Misses        646      647       +1     
- Partials      312      313       +1     

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