chore: Remove explicit caller argument info on ThrowIfNull.

Author: peombwa

src/lib/Helpers/ValidationHelpers.cs

@@ -10,11 +10,6 @@ internal static void ValidateNullOrWhitespace(string parameterName, string? valu
                 throw new ArgumentNullException(parameterName, string.Format(ErrorMessage.FieldIsRequired, parameterName, parentName));
         }
 
-        internal static void ValidateNullObject(string parameterName, object? value)
-        {
-            ArgumentNullException.ThrowIfNull(value, parameterName);
-        }
-
         internal static void ValidateLength(string parameterName, string? value, int maxLength)
         {
             if (value?.Length > maxLength)

src/lib/OpenAI/OpenAIPluginManifest.cs

@@ -137,8 +137,8 @@ private void Validate(OpenAIPluginManifest openAIPluginManifest)
         ValidationHelpers.ValidateLength(nameof(DescriptionForModel), openAIPluginManifest.DescriptionForModel, 8000);
 
         ValidationHelpers.ValidateNullOrWhitespace(nameof(SchemaVersion), openAIPluginManifest.SchemaVersion, nameof(OpenAIPluginManifest));
-        ValidationHelpers.ValidateNullObject(nameof(Auth), openAIPluginManifest.Auth);
-        ValidationHelpers.ValidateNullObject(nameof(Api), openAIPluginManifest.Api);
+        ArgumentNullException.ThrowIfNull(openAIPluginManifest.Auth);
+        ArgumentNullException.ThrowIfNull(openAIPluginManifest.Api);
         ValidationHelpers.ValidateNullOrWhitespace(nameof(LogoUrl), openAIPluginManifest.LogoUrl, nameof(OpenAIPluginManifest));
         ValidationHelpers.ValidateEmail(nameof(ContactEmail), openAIPluginManifest.ContactEmail, nameof(OpenAIPluginManifest));
         ValidationHelpers.ValidateNullOrWhitespace(nameof(LegalInfoUrl), openAIPluginManifest.LegalInfoUrl, nameof(OpenAIPluginManifest));