.Net: Adding retry to flakey test and switch to a different model (#12439)

### Description

Adding retry to flakey test and switch to a different model

### Contribution Checklist

<!-- Before submitting this PR, please make sure: -->

- [ ] The code builds clean without any errors or warnings
- [ ] The PR follows the [SK Contribution
Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
and the [pre-submission formatting
script](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md#development-scripts)
raises no violations
- [ ] All unit tests pass, and I have added new tests where possible
- [ ] I didn't break anyone 😄

Author: westey-m

dotnet/src/IntegrationTests/Connectors/OpenAI/OpenAIChatCompletion_NonStreamingTests.cs

@@ -13,6 +13,7 @@
 using Microsoft.SemanticKernel.TextGeneration;
 using OpenAI.Chat;
 using SemanticKernel.IntegrationTests.TestSettings;
+using xRetry;
 using Xunit;
 
 namespace SemanticKernel.IntegrationTests.Connectors.OpenAI;
@@ -142,11 +143,11 @@ public async Task TextGenerationShouldReturnMetadataAsync()
         Assert.Empty((logProbabilityInfo as IReadOnlyList<ChatTokenLogProbabilityDetails>)!);
     }
 
-    [Fact]
+    [RetryFact]
     public async Task ChatCompletionWithWebSearchAsync()
     {
         // Arrange
-        var kernel = this.CreateAndInitializeKernel(modelIdOverride: "gpt-4o-mini-search-preview");
+        var kernel = this.CreateAndInitializeKernel(modelIdOverride: "gpt-4o-search-preview");
         var chatService = kernel.Services.GetRequiredService<IChatCompletionService>();
         var settings = new OpenAIPromptExecutionSettings
         {