Avoid using generic overload for all enum types

Author: captainsafia

src/Microsoft.OpenApi/Extensions/EnumExtensions.cs

@@ -44,25 +44,6 @@ public static string GetDisplayName(this Enum enumValue)
             return attribute == null ? enumValue.ToString() : attribute.Name;
         }
 
-        /// <summary>
-        /// Gets the enum display name for <see typeparamref="T"/> without the use of reflection. 
-        /// </summary>
-        /// <typeparam name="T">The type of the enum value.</typeparam>
-        /// <param name="enumValue">The enum value.</param>
-        /// <returns>The display string to use.</returns>
-        public static string GetDisplayName<T>(this T enumValue) where T : Enum
-        {
-            return enumValue switch
-            {
-                ParameterStyle parameterStyle => parameterStyle.GetDisplayName(),
-                ParameterLocation parameterLocation => parameterLocation.GetDisplayName(),
-                ReferenceType referenceType => referenceType.GetDisplayName(),
-                OperationType operationType => operationType.GetDisplayName(),
-                SecuritySchemeType securitySchemeType => securitySchemeType.GetDisplayName(),
-                _ => enumValue.ToString()
-            };
-        }
-
         /// <summary>
         /// Gets the enum display for name <see cref="ParameterStyle" /> without the use of reflection.
         /// </summary>