@@skipRetry is ignored in retry-link

[WIStudent]

Do you want to request a feature or report a bug?
Bug

What is the current behavior?
While looking for a way to configure the retry behaviour I stumbled upon the @@skipRetry variable in retry-link. I then noticed that it will always be ignored because the variable is removed before it can reach the retry-link.

    const link = ApolloLink.from([
        retryLink,
        origLink,
    ]);

    return new ApolloLink((operation, forward) => {
        const { [SKIP_RETRY_KEY]: skipRetry = false, ...otherVars } = operation.variables;

        if (skipRetry) {
            operation.variables = otherVars;
        }

        return link.request(operation, forward);
    });

https://github.com/awslabs/aws-mobile-appsync-sdk-js/blob/master/packages/aws-appsync/src/link/retry-link.ts

If the @@skipRetry variable is the intended way to disable retries, then this part needs to be changed in a way that removes the variable for origLink, but not for retryLink.