Revert Relay Classic non-support (#3606)

This reverts commit e8551b994d313ea023855a790c87acc4833150f9.

src/language-js/embed.js

@@ -34,15 +34,16 @@ function embed(path, print, textToDoc /*, options */) {
        * graphql`...`
        * graphql.experimental`...`
        * gql`...`
+       *
+       * This intentionally excludes Relay Classic tags, as Prettier does not
+       * support Relay Classic formatting.
        */
       if (
         parent &&
         ((parent.type === "TaggedTemplateExpression" &&
           ((parent.tag.type === "MemberExpression" &&
-            ((parent.tag.object.name === "graphql" &&
-              parent.tag.property.name === "experimental") ||
-              (parent.tag.object.name === "Relay" &&
-                parent.tag.property.name === "QL"))) ||
+            parent.tag.object.name === "graphql" &&
+            parent.tag.property.name === "experimental") ||
             (parent.tag.type === "Identifier" &&
               (parent.tag.name === "gql" || parent.tag.name === "graphql")))) ||
           (parent.type === "CallExpression" &&

tests/multiparser_js_graphql/__snapshots__/jsfmt.spec.js.snap

@@ -394,7 +394,6 @@ gql\`
 
 exports[`react-relay.js 1`] = `
 const { graphql } = require("react-relay");
-const Relay = require("react-relay/classic");
 
 graphql\`
  mutation     MarkReadNotificationMutation(
@@ -411,17 +410,8 @@ graphql.experimental\`
   )
 { markReadNotification(data: $input ) { notification {seenState} } }
 \`;
-
-Relay.QL\`
- mutation     MarkReadNotificationMutation(
-    $input
-    : MarkReadNotificationData!
-  )
-{ markReadNotification(data: $input ) { notification {seenState} } }
-\`;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 const { graphql } = require("react-relay");
-const Relay = require("react-relay/classic");
 
 graphql\`
   mutation MarkReadNotificationMutation($input: MarkReadNotificationData!) {
@@ -443,14 +433,4 @@ graphql.experimental\`
   }
 \`;
 
-Relay.QL\`
-  mutation MarkReadNotificationMutation($input: MarkReadNotificationData!) {
-    markReadNotification(data: $input) {
-      notification {
-        seenState
-      }
-    }
-  }
-\`;
-
 `;

tests/multiparser_js_graphql/react-relay.js

@@ -1,5 +1,4 @@
 const { graphql } = require("react-relay");
-const Relay = require("react-relay/classic");
 
 graphql`
  mutation     MarkReadNotificationMutation(
@@ -16,11 +15,3 @@ graphql.experimental`
   )
 { markReadNotification(data: $input ) { notification {seenState} } }
 `;
-
-Relay.QL`
- mutation     MarkReadNotificationMutation(
-    $input
-    : MarkReadNotificationData!
-  )
-{ markReadNotification(data: $input ) { notification {seenState} } }
-`;