fix: drop deprecated jquery functions

[Antreesy]

• Ref Migrate jQuery event usages to event-bus #1447
• update eslint rules
• drop usage of jquery:
  • this.$refs.icon and this.$refs.button are not existing anymore in the code, so doesn't work either way
  • $.Event('OCA.Notification.Action') is removed from server code
  • this.$parent._$el.fadeOut(OC.menuSpeed) is superseded with Vue transition-group

[nickvergessen]

$.Event('OCA.Notification.Action') is removed from server code

Any app could have listened to it.
So we should add it to the upgrade docs

[Antreesy]

So we should add it to the upgrade docs

You meant here? https://docs.nextcloud.com/server/latest/developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_31.html

[Antreesy]

/compile /