[#3351] Partner info in family component

[SilviaAmAm]

Fixes #3351

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (464e155) 95.90% compared to head (b7d3287) 95.91%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3525   +/-   ##
=======================================
  Coverage   95.90%   95.91%           
=======================================
  Files         671      671           
  Lines       21439    21475   +36     
  Branches     2458     2469   +11     
=======================================
+ Hits        20561    20597   +36     
  Misses        609      609           
  Partials      269      269           

Files	Coverage Δ
src/openforms/contrib/haal_centraal/clients/brp.py	100.00% <100.00%> (ø)
src/openforms/formio/components/custom.py	88.50% <100.00%> (+0.27%)	⬆️
...rmio/components/np_family_members/haal_centraal.py	100.00% <100.00%> (ø)
...rms/formio/components/np_family_members/stuf_bg.py	92.85% <100.00%> (+3.38%)	⬆️

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[SilviaAmAm]

Temporary until we have an actual test response