Fix boolean logic error in hierarchy support detection

[Copilot]

Addresses Coderabbit feedback from #687: the condition for detecting hierarchy support used or with not isinstance, which always evaluated to True. This caused hierarchy support to be incorrectly enabled for ProfileSchemaAPI, GenericSchemaAPI, and TemplateSchemaAPI types.

Changes

• Fixed isinstance check to use tuple syntax for multiple types
• Changed from not isinstance(x, A) or not isinstance(x, B) or not isinstance(x, C) to not isinstance(x, (A, B, C))

Before/After

# Before - always True due to OR logic
if (
    not isinstance(schema, ProfileSchemaAPI)
    or not isinstance(schema, GenericSchemaAPI)
    or not isinstance(schema, TemplateSchemaAPI)
):
    self._hierarchy_support = getattr(schema, "hierarchy", None) is not None

# After - correct exclusion logic  
if not isinstance(schema, (ProfileSchemaAPI, GenericSchemaAPI, TemplateSchemaAPI)):
    self._hierarchy_support = getattr(schema, "hierarchy", None) is not None

This ensures hierarchy support is only enabled for node schemas that actually support hierarchical relationships.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@             Coverage Diff             @@
##           develop     #688      +/-   ##
===========================================
+ Coverage    76.01%   76.03%   +0.02%     
===========================================
  Files          113      113              
  Lines         9742     9742              
  Branches      1490     1490              
===========================================
+ Hits          7405     7407       +2     
+ Misses        1841     1840       -1     
+ Partials       496      495       -1     

Flag	Coverage Δ
integration-tests	34.63% <100.00%> (+0.02%)	⬆️
python-3.10	49.94% <100.00%> (ø)
python-3.11	49.94% <100.00%> (ø)
python-3.12	49.94% <100.00%> (+0.04%)	⬆️
python-3.13	49.92% <100.00%> (+0.02%)	⬆️
python-3.14	51.58% <100.00%> (ø)
python-filler-3.12	23.94% <0.00%> (ø)

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Files with missing lines	Coverage Δ
infrahub_sdk/node/node.py	79.17% <100.00%> (+0.21%)	⬆️

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