cleanup site replication error handling (#15113)

site replication errors were printed at
various random locations, repeatedly - this
PR attempts to remove double logging and
capture all of them at a common place.

This PR also enhances the code to show
partial success and errors as well.

cmd/api-errors.go

@@ -2231,7 +2231,7 @@ func toAPIError(ctx context.Context, err error) APIError {
 			}
 		case crypto.Error:
 			apiErr = APIError{
-				Code:           "XMinIOEncryptionError",
+				Code:           "XMinioEncryptionError",
 				Description:    e.Error(),
 				HTTPStatusCode: http.StatusBadRequest,
 			}