Make useragents could be cleaned when cmdlet is successfully executed (#18314)

Without the changes, useragent could still accumulate event the cmdlet is executed successfully.

Author: dolauli

src/Accounts/Authentication/Factories/ClientFactory.cs

@@ -460,7 +460,6 @@ public DelegatingHandler[] GetCustomHandlers()
 
         public void RemoveUserAgent(string name)
         {
-            name = GetProductInfoHeaderKey(name);
             if (_userAgents != null && _userAgents.Keys != null)
             {
                 var agents = _userAgents.Keys.Where((k) => k.Product != null && string.Equals(k.Product.Name, name, StringComparison.OrdinalIgnoreCase));