Function isMergeTagEntry

Returns entry is {
    fields: {
        nt_fallback?: string;
        nt_mergetag_id: string;
        nt_name: string;
    };
    metadata: {
        concepts?: {
            sys: { id: string; linkType: "TaxonomyConcept"; type: "Link" };
        }[];
        tags: { sys: { id: string; linkType: "Tag"; type: "Link" } }[];
    };
    sys: {
        contentType: {
            sys: { id: "nt_mergetag"; linkType: "ContentType"; type: "Link" };
        };
        createdAt: any;
        environment: {
            sys: { id: string; linkType: "Environment"; type: "Link" };
        };
        id: string;
        locale?: string;
        publishedVersion: number;
        revision: number;
        space: { sys: { id: string; linkType: "Space"; type: "Link" } };
        type: "Entry";
        updatedAt: any;
    };
}

true if the value conforms to MergeTagEntry, otherwise false.