fix(ConfigurableMessageHandler): Fix quota project validation

Author: robertvoinescu-work

Src/Support/Google.Apis.Core/Http/ConfigurableMessageHandler.cs

@@ -655,14 +655,15 @@ bool DisposeAndReturnFalse(IDisposable disposable)
             }
 
             return response;
-        }
 
-        private void CheckValidAfterInterceptors(HttpRequestMessage request)
-        {
-            if (request.Headers.Contains(QuotaProjectHeaderName))
+            void CheckValidAfterInterceptors(HttpRequestMessage request)
             {
-                throw new InvalidOperationException($"{QuotaProjectHeaderName} header can only be added through the credential or through the <Product>ClientBuilder.");
+                if (triesRemaining == maxRetries && request.Headers.Contains(QuotaProjectHeaderName))
+                {
+                    throw new InvalidOperationException($"{QuotaProjectHeaderName} header can only be added through the credential or through the <Product>ClientBuilder.");
+                }
             }
+
         }
 
         private async Task CredentialInterceptAsync(HttpRequestMessage request, CancellationToken cancellationToken)