Tweaks to showing new version available

- Added frontend translation for english
- Moved frontend api logic to hook and backend api space
- Added swagger schema for the new api endpoint
- Moved backend logic to its own internal file
- Added user agent header to github api check
- Added cypress integration test for version check api
- Added a memory cache item from github check to avoid hitting it too
  much

frontend/src/api/backend/index.ts

@@ -1,3 +1,4 @@
+export * from "./checkVersion";
 export * from "./createAccessList";
 export * from "./createCertificate";
 export * from "./createDeadHost";