Add setting typename, display_label, and kind if it exists when calling _init_relationships

[FragmentedPacket]

Fixes #455

• We set the __typename when relationships are already a RelatedNode as we were omitting it previously so it could not do the lookup of the object in the store.
• also sets kind and display_label for the peer if it exists on the input RelatedNode

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

@@            Coverage Diff             @@
##           stable     #456      +/-   ##
==========================================
+ Coverage   75.58%   75.62%   +0.04%     
==========================================
  Files         100      100              
  Lines        8769     8767       -2     
  Branches     1712     1712              
==========================================
+ Hits         6628     6630       +2     
+ Misses       1663     1661       -2     
+ Partials      478      476       -2     

Flag	Coverage Δ
integration-tests	34.65% <37.50%> (+0.03%)	⬆️
python-3.10	47.86% <50.00%> (-0.07%)	⬇️
python-3.11	47.88% <50.00%> (-0.05%)	⬇️
python-3.12	47.83% <50.00%> (-0.07%)	⬇️
python-3.13	47.86% <50.00%> (-0.05%)	⬇️
python-3.9	46.55% <50.00%> (-0.05%)	⬇️
python-filler-3.12	25.26% <25.00%> (+0.02%)	⬆️

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Files with missing lines	Coverage Δ
infrahub_sdk/node/node.py	74.93% <100.00%> (-0.26%)	⬇️
infrahub_sdk/node/related_node.py	90.25% <100.00%> (+3.09%)	⬆️

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[dgarros]

Please can either of you add a changelog before merging this PR