Remove checks for old Azure API versions

Remove some code checking for old API versions that did not yet support
structured output.

Also remove code that captures and replaces error messages related to output
format, returning the server error instead.

Author: Cheuk Lun Ko

+llms/+azure/validateResponseFormat.m

@@ -61,8 +61,6 @@
 catalog("llms:mustSetFunctionsForCall") = "When no functions are defined, ToolChoice must not be specified.";
 catalog("llms:mustBeMessagesOrTxt") = "Message must be nonempty string, character array, cell array of character vectors, or messageHistory object.";
 catalog("llms:invalidOptionAndValueForModel") = "'{1}' with value '{2}' is not supported for model ""{3}"".";
-catalog("llms:noStructuredOutputForAzureDeployment") = "Structured output is not supported for deployment ""{1}"".";
-catalog("llms:structuredOutputRequiresAPI") = "Structured output is not supported for API version ""{1}"". Use APIVersion=""2024-08-01-preview"" or newer.";
 catalog("llms:invalidOptionForModel") = "Invalid argument name {1} for model ""{2}"".";
 catalog("llms:functionNotAvailableForModel") = "Image editing is not supported for model ""{1}"".";
 catalog("llms:promptLimitCharacter") = "Prompt must contain at most {1} characters for model ""{2}"".";

+llms/+openai/validateMessageSupported.m

@@ -249,8 +249,6 @@
                 messagesStruct = horzcat(this.SystemPrompt, messagesStruct);
             end
 
-            llms.azure.validateResponseFormat(nvp.ResponseFormat, this, messagesStruct);
-
             toolChoice = convertToolChoice(this, nvp.ToolChoice);
 
             if isfield(nvp,"StreamFun")
@@ -281,15 +279,7 @@
             end
 
             if isfield(response.Body.Data,"error")
-                err = response.Body.Data.error.message;
-                if startsWith(err,"'json_schema' is not one of ['json_object', 'text']") || ...
-                    startsWith(replace(err,newline," "),...
-                        "Invalid parameter: 'response_format' of type 'json_schema' is not supported with this model.")
-                    error("llms:noStructuredOutputForAzureDeployment", ...
-                        llms.utils.errorMessageCatalog.getMessage( ...
-                            "llms:noStructuredOutputForAzureDeployment",this.DeploymentID));
-                end
-                error("llms:apiReturnedError",llms.utils.errorMessageCatalog.getMessage("llms:apiReturnedError",err));
+                error("llms:apiReturnedError",llms.utils.errorMessageCatalog.getMessage("llms:apiReturnedError",response.Body.Data.error.message));
             end
 
             if ~isempty(text)

+llms/+openai/validateResponseFormat.m

@@ -110,14 +110,6 @@ function jsonFormatWithSystemPrompt(testCase)
                 "string");
         end
 
-        function responseFormatRequiresNewAPI(testCase)
-            chat = azureChat(APIVersion="2024-02-01");
-            testCase.verifyError(@() generate(chat, ...
-                "What is the smallest prime?", ...
-                ResponseFormat=struct("number",1)), ...
-                "llms:structuredOutputRequiresAPI");
-        end
-
         function maxNumTokensWithReasoningModel(testCase)
             % Unlike OpenAI, Azure requires different parameter names for
             % different models (max_tokens vs max_completion_tokens). Since
@@ -177,14 +169,6 @@ function canUseAPIVersions(testCase, APIVersions)
             testCase.verifyClass(response,'string');
             testCase.verifyGreaterThan(strlength(response),0);
         end
-
-        function specialErrorForUnsupportedResponseFormat(testCase)
-            testCase.verifyError(@() generate(...
-                azureChat(DeploymentID="o1-mini"), ...
-                "What is the smallest prime?", ...
-                ResponseFormat=struct("number",1)), ...
-                "llms:noStructuredOutputForAzureDeployment");
-        end
     end
 
     methods