Fix edge response deserialization for non-binary result types

[timmarkhuff]

Problem

When submitting an image query to a multi-class (or other non-binary) detector via the edge endpoint, the SDK deserializes the result as BinaryClassificationResult instead of MultiClassificationResult. This happens because:

1. Edge responses include result_type at the ImageQuery level but omit it from the nested result dict.
2. Pydantic resolves the Union on ImageQuery.result by trying each type in order. Since result_type is Optional in all result models, BinaryClassificationResult matches first due to having the same shape as MultiClassificationResult.

This causes result_type=None on the result object, spurious "Unrecognized internal label" warnings, and AttributeError when accessing fields specific to the correct result type.

Fix

Added _propagate_result_type which copies the ImageQuery-level result_type into the result dict before Pydantic parsing, so the Union resolves to the correct type. Applied at all three image query deserialization sites: get_image_query, list_image_queries, and submit_image_query.