cli: use new eslint plugin + fix issues

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/create-app/bin/backstage-create-app

@@ -25,7 +25,7 @@ if (!isLocal || process.env.BACKSTAGE_E2E_CLI_TEST) {
   require('..');
 } else {
   // Only used for development, so should be a devDependency
-  // eslint-disable-next-line import/no-extraneous-dependencies
+  // eslint-disable-next-line @backstage/no-undeclared-imports
   require('ts-node').register({
     transpileOnly: true,
     project: path.resolve(__dirname, '../../../tsconfig.json'),