enhance: listen on favourite events

[schweigisito]

Description

This PR may fix #3016 by listening on favourite SSEs sent by backend.

Related Issue

• Fixes UI reacts on SSEs for added/removed favorite-items #3016

How Has This Been Tested?

• This PR has been tested with a backend in which enhance: send events for adding/removing favourite items opencloud#3229 has been applied
• Opened two browser sessions with same user
• In window A a file has been added to and removed from favourites
• The changes made it immediately to browser window B by reacting to item-favorite-added and item-favorite-removed events on the SSE connection.

Types of changes

• Bugfix
• Enhancement (a change that doesn't break existing code or deployments)
• Breaking change (a modification that affects current functionality)
• Technical debt (addressing code that needs refactoring or improvements)
• Tests (adding or improving tests)
• Documentation (updates or additions to documentation)
• Maintenance (like dependency updates or tooling adjustments)

[JammingBen]

LGTM, thanks!