MC-18996: GraphQl Url Resolver doesn't return any results if the url_key doesn't have the extension

- add tests

Author: cpartica

app/code/Magento/UrlRewriteGraphQl/etc/schema.graphqls

@@ -2,7 +2,7 @@
 # See COPYING.txt for license details.
 
 type Query {
-    urlResolver(url: String!): EntityUrl @resolver(class: "Magento\\UrlRewriteGraphQl\\Model\\Resolver\\EntityUrl") @doc(description: "The urlResolver query returns the relative URL for a specified product, category or CMS page") @cache(cacheIdentity: "Magento\\UrlRewriteGraphQl\\Model\\Resolver\\UrlRewrite\\UrlResolverIdentity")
+    urlResolver(url: String!): EntityUrl @resolver(class: "Magento\\UrlRewriteGraphQl\\Model\\Resolver\\EntityUrl") @doc(description: "The urlResolver query returns the relative URL for a specified product, category or CMS page, using as input a url_key prepended by the url_suffix, if one exists") @cache(cacheIdentity: "Magento\\UrlRewriteGraphQl\\Model\\Resolver\\UrlRewrite\\UrlResolverIdentity")
 }
 
 type EntityUrl @doc(description: "EntityUrl is an output object containing the `id`, `relative_url`, and `type` attributes") {