Return TRecord instead of object in GoogleTextSearch.GetSearchResultsAsync

Changes:
- Update GoogleTextSearch.GetSearchResultsAsync to return KernelSearchResults<GoogleWebPage> instead of KernelSearchResults<object>
- Remove wasteful .Cast<object>() call
- Update test to use strongly-typed GoogleWebPage instead of casting from object

Benefits:
- Eliminates runtime casting overhead
- Provides compile-time type safety
- Improves IntelliSense for consumers

This change aligns with PR #13318 interface fix that changed ITextSearch<TRecord>.GetSearchResultsAsync to return KernelSearchResults<TRecord>.

Author: alzarei

dotnet/src/Plugins/Plugins.UnitTests/Web/Google/GoogleTextSearchTests.cs

@@ -303,15 +303,15 @@ public async Task GenericGetSearchResultsReturnsSuccessfullyAsync()
             searchEngineId: "SearchEngineId");
 
         // Act - Use generic interface with GoogleWebPage
-        KernelSearchResults<object> results = await textSearch.GetSearchResultsAsync("What is the Semantic Kernel?", new TextSearchOptions<GoogleWebPage> { Top = 10, Skip = 0 });
+        KernelSearchResults<GoogleWebPage> results = await textSearch.GetSearchResultsAsync("What is the Semantic Kernel?", new TextSearchOptions<GoogleWebPage> { Top = 10, Skip = 0 });
 
         // Assert
         Assert.NotNull(results);
         Assert.NotNull(results.Results);
         var resultList = await results.Results.ToListAsync();
         Assert.NotNull(resultList);
         Assert.Equal(4, resultList.Count);
-        foreach (GoogleWebPage result in resultList.Cast<GoogleWebPage>())
+        foreach (GoogleWebPage result in resultList)
         {
             Assert.NotNull(result.Title);
             Assert.NotNull(result.Snippet);

dotnet/src/Plugins/Plugins.Web/Google/GoogleTextSearch.cs

@@ -94,14 +94,14 @@ public async Task<KernelSearchResults<string>> SearchAsync(string query, TextSea
     #region ITextSearch<GoogleWebPage> Implementation
 
     /// <inheritdoc/>
-    public async Task<KernelSearchResults<object>> GetSearchResultsAsync(string query, TextSearchOptions<GoogleWebPage>? searchOptions = null, CancellationToken cancellationToken = default)
+    public async Task<KernelSearchResults<GoogleWebPage>> GetSearchResultsAsync(string query, TextSearchOptions<GoogleWebPage>? searchOptions = null, CancellationToken cancellationToken = default)
     {
         var legacyOptions = ConvertToLegacyOptions(searchOptions);
         var searchResponse = await this.ExecuteSearchAsync(query, legacyOptions, cancellationToken).ConfigureAwait(false);
 
         long? totalCount = searchOptions?.IncludeTotalCount == true ? long.Parse(searchResponse.SearchInformation.TotalResults) : null;
 
-        return new KernelSearchResults<object>(this.GetResultsAsGoogleWebPageAsync(searchResponse, cancellationToken).Cast<object>(), totalCount, GetResultsMetadata(searchResponse));
+        return new KernelSearchResults<GoogleWebPage>(this.GetResultsAsGoogleWebPageAsync(searchResponse, cancellationToken), totalCount, GetResultsMetadata(searchResponse));
     }
 
     /// <inheritdoc/>