fix(server): use randomized cron for version check scheduling (#27626)

Also removes unnecessary rate limit

server/src/enum.ts

@@ -848,6 +848,7 @@ export enum AssetVisibility {
 export enum CronJob {
   LibraryScan = 'LibraryScan',
   NightlyJobs = 'NightlyJobs',
+  VersionCheck = 'VersionCheck',
 }
 
 export enum ApiTag {