`prefer-spread` flagging `Array#concat(…)` for non-iterable objects

[bdunks]

After upgrading to 27.0.0, I'm finding that the prefer-spread rule is raising ERROR_ARRAY_CONCAT errors when a concat method exists on non-iterable objects.

Specifically, this I've witnessed this occurring when chaining an ApolloLink for the ApolloClient. The ApolloLink object defines a static concat method.

const client = new ApolloClient({
  link: authLink.concat(httpLink),  //<-- Raises `Array#concat(…)` error
  cache: new InMemoryCache({}),
});

In this case, authLink is of type ApolloLink, which has the following type definition:

export declare class ApolloLink {
    static empty(): ApolloLink;
    static from(links: (ApolloLink | RequestHandler)[]): ApolloLink;
    static split(test: (op: Operation) => boolean, left: ApolloLink | RequestHandler, right?: ApolloLink | RequestHandler): ApolloLink;
    static execute(link: ApolloLink, operation: GraphQLRequest): Observable<FetchResult>;
    static concat(first: ApolloLink | RequestHandler, second: ApolloLink | RequestHandler): ApolloLink;
    constructor(request?: RequestHandler);
    split(test: (op: Operation) => boolean, left: ApolloLink | RequestHandler, right?: ApolloLink | RequestHandler): ApolloLink;
    concat(next: ApolloLink | RequestHandler): ApolloLink;
    request(operation: Operation, forward?: NextLink): Observable<FetchResult> | null;
    protected onError(error: any, observer?: ZenObservable.Observer<FetchResult>): false | void;
    setOnError(fn: ApolloLink["onError"]): this;
}