The original requirement from here: https://issues.redhat.com/browse/ACM-22400

Description:
As a Global Hub admin, I want the ability to configure different options for event transmission so that I can choose between single mode and batch mode depending on performance and reliability needs.

Acceptance Criteria:

1. Single mode: events are transmitted one by one immediately.
2. Batch mode: events are accumulated and transmitted in batches (size and interval configurable).
3. Mode can be switched without restarting the system
4. The event include: kube events: clusterupgrade, managedcluster, root policy, replicated policy event

Out of Scope:

• • Changes to event payload schema.

• • Transport protocol modifications.