feat: add update subscription with cron job support

[EkkoG]

Background

For now, subscription cannot be updated after it be added, this PR add ability update subscription with a cron job, frontend can add a dialog to let users fill a cron job expression or a duration like update per hour.

Checklist

• [x] The Pull Request has been fully tested
• [x] There's an entry in the CHANGELOGS
• [ ] There is a user-facing docs PR against https://github.com/daeuniverse/dae-wing

Full Changelogs

• Support update subscription with cron job

Issue Reference

no

Test Result