Schedule menu in ticket shop should consider schedule state from talk

[lcduong]

This PR related to issue #353 Implement:

1. API to handle schedule state trigged by Talk system.
2. Remove schedule/session/speaker link set in event settings - auto set when is_show_schedule is True (triggered by Talk system.)

Summary by Sourcery

Implement an API to manage schedule state changes from the Talk system and automate the configuration of schedule-related links based on the schedule's visibility status.

New Features:

• Introduce an API endpoint to handle schedule state changes triggered by the Talk system, allowing the schedule menu to reflect the current state.

Enhancements:

• Automatically set schedule, session, and speaker links when 'is_show_schedule' is true, removing the need for manual configuration in event settings.