fix: return 404 instead of 500 for invalid identity_pk in feature states

[PrakashWebDevX]

fix: return 404 instead of 500 for invalid identity_pk in feature states

IdentityFeatureStateViewSet.get_queryset() passed the raw identity_pk
URL kwarg directly into a queryset filter, causing Django's ORM to
raise an unhandled ValueError when the value wasn't a valid integer
(e.g. a malformed or non-numeric ID).

Use get_object_or_404 to resolve the identity first, matching the
existing pattern already used in this same class's all() action.

Fixes #7361

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• api/features/views.py

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📝 Walkthrough

Walkthrough

IdentityFeatureStateViewSet.get_queryset now resolves the identity from the identity_pk URL parameter with get_object_or_404. It then filters feature states by the resolved identity. Requests for a non-existent identity now return a 404 instead of an empty result.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~5 minutes

Severity of issue fixed: Medium

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

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