fix(serializer): discriminated input patch fix#8427
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… DTO subclass When an operation uses a plain (non-ApiResource) input DTO carrying a Serializer DiscriminatorMap, the normalizer pins resource_class to the abstract input base. The discriminator resolves the concrete subclass for instantiation, but constructor/setter argument metadata was still read from the abstract base, so an object-typed argument declared only on the subclass resolved to no type and its nested payload was passed as a raw array, triggering a TypeError (HTTP 500). Pin resource_class to the discriminator-resolved concrete class on the input path so subclass-only argument types are found and denormalized. Regression from api-platform#7779 (4.2.17). Fixes api-platform#8414
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Additional merge PATCH fix on top of #8424