IFC-2156: Remove proposed change comments created_at and created_by attribute and relationship

[solababs]

Remove proposed change comments created_at and created_by attribute and relationship

Infrahub PR - opsmill/infrahub#8362

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@                 Coverage Diff                  @@
##           infrahub-develop     #823      +/-   ##
====================================================
- Coverage             81.69%   80.58%   -1.11%     
====================================================
  Files                   118      118              
  Lines                 11919    10229    -1690     
  Branches               2047     1538     -509     
====================================================
- Hits                   9737     8243    -1494     
+ Misses                 1553     1456      -97     
+ Partials                629      530      -99     

Flag	Coverage Δ
integration-tests	40.33% <ø> (-2.78%)	⬇️
python-3.10	51.74% <ø> (-2.58%)	⬇️
python-3.11	51.76% <ø> (-2.58%)	⬇️
python-3.12	51.76% <ø> (-2.58%)	⬇️
python-3.13	51.76% <ø> (-2.58%)	⬇️
python-3.14	53.44% <ø> (-3.02%)	⬇️
python-filler-3.12	24.01% <ø> (+0.33%)	⬆️

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Files with missing lines	Coverage Δ
infrahub_sdk/protocols.py	100.00% <ø> (ø)

... and 11 files with indirect coverage changes

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[ogenstad]

This should be merged after Infrahub 1.8 and Infrahub SDK 1.19.0 is out and the infrahub-develop branch targets Infrahub 1.9.