IHS-217: Fix object profile file validation for mandatory field

[solababs]

Skip mandatory field validation during object loading when object_profile is specified.

Closes #908

[cloudflare-workers-and-pages]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@           Coverage Diff           @@
##           stable     #980   +/-   ##
=======================================
  Coverage   81.41%   81.41%           
=======================================
  Files         134      134           
  Lines       11347    11347           
  Branches     1703     1703           
=======================================
  Hits         9238     9238           
  Misses       1566     1566           
  Partials      543      543           

Flag	Coverage Δ
integration-tests	41.85% <100.00%> (+<0.01%)	⬆️
python-3.10	54.34% <100.00%> (-0.02%)	⬇️
python-3.11	54.36% <100.00%> (+0.01%)	⬆️
python-3.12	54.36% <100.00%> (ø)
python-3.13	54.34% <100.00%> (-0.02%)	⬇️
python-3.14	54.34% <100.00%> (ø)
python-filler-3.12	22.74% <0.00%> (ø)

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Files with missing lines	Coverage Δ
infrahub_sdk/spec/object.py	85.24% <100.00%> (ø)

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