Fix AzureAIInferenceEmbeddingGenerator to respect EmbeddingGeneration…

…Options.Dimensions (dotnet#5575)

Merge conflict blip.

src/Libraries/Microsoft.Extensions.AI.AzureAIInference/AzureAIInferenceEmbeddingGenerator.cs

@@ -156,7 +156,7 @@ private EmbeddingsOptions ToAzureAIOptions(IEnumerable<string> inputs, Embedding
     {
         EmbeddingsOptions result = new(inputs)
         {
-            Dimensions = _dimensions,
+            Dimensions = options?.Dimensions ?? _dimensions,
             Model = options?.ModelId ?? Metadata.ModelId,
             EncodingFormat = format,
         };