feat: 🎸 Handle rate limiting (#3257)

✅ Closes: https://hashicorp.atlassian.net/browse/ICU-12035

addons/api/package.json

@@ -36,6 +36,7 @@
     "ember-can": "^8.0.0",
     "ember-cli-babel": "^8.2.0",
     "ember-cli-htmlbars": "^6.3.0",
+    "ember-concurrency": "^4.0.3",
     "ember-data": "~5.3.12",
     "ember-get-config": "^2.1.1",
     "ember-inflector": "^6.0.0",