Add MSI / command line option / configuration to disable update notifications

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Problem
The Nextcloud Talk app sends a notification every time a new update is available. In a enterprise environment, this becomes problematic as users often do not have the necessary permissions to perform updates or installations, which can lead to unnecessary confusion that could be avoided.

Proposed solution
Introduce a configurable setting that allows update notifications to be disabled. This setting should be accessible to administrators and support preconfiguration during deployment—such as via an MSI property or a predefined configuration file E.g.

• MSI Property UPDATE_NOTIFICATIONS=FALSE
• config.json located in proper place.

Describe alternatives you've considered

• Disabling all notifications (This goes against the core concepts of Talk so not an option)
• Instruct users to disregard notifications about updates. (Introduces confusion for users)
  In reality there arent any real alternatives.

References
Other Nextcloud Clients support similar functions so it would be nice for Talk to do the same.

Start by tracing the update-notification behavior and the deployment configuration path for the proposed MSI property UPDATE_NOTIFICATIONS and config.json. Done means administrators can preconfigure this setting and suppress update notifications without disabling other Talk notifications.