Revert "Support gts/gjs in blueprint (#1013)" (#1014)

This reverts commit c2d7a83.

Author: mkszepp

ember-basic-dropdown/blueprints/ember-basic-dropdown/index.js

@@ -49,12 +49,6 @@ module.exports = {
         if (!fs.existsSync(file)) {
           file = path.join('app', `app.ts`);
         }
-        if (!fs.existsSync(file)) {
-          file = path.join('app', `app.gts`);
-        }
-        if (!fs.existsSync(file)) {
-          file = path.join('app', `app.gjs`);
-        }
         if (fs.existsSync(file)) {
           this.ui.writeLine(`Added import statement to ${file}`);
           promises.push(
@@ -77,24 +71,6 @@ module.exports = {
           {},
         ),
       );
-    } else {
-      applicationFile = path.join(templatePath, `application.gts`);
-      if (!fs.existsSync(file)) {
-        file = path.join(templatePath, `application.gjs`);
-      }
-      if (fs.existsSync(applicationFile)) {
-        this.ui.writeLine(`Added wormhole statement to ${applicationFile}`);
-        promises.push(
-          this.insertIntoFile(applicationFile, `import BasicDropdownWormhole from 'ember-basic-dropdown/components/basic-dropdown-wormhole';${EOL}`, {
-            before: `<template>`,
-          }),
-        );
-        promises.push(
-          this.insertIntoFile(applicationFile, `${EOL} <BasicDropdownWormhole />`, {
-            after: `<template>`,
-          }),
-        );
-      }
     }
 
     return Promise.all(promises);