feat(core): Coordinate manual workflow activation and deactivation in multi-main scenario (#7643)

Followup to #7566 | Story: https://linear.app/n8n/issue/PAY-926

### Manual workflow activation and deactivation

In a multi-main scenario, if the user manually activates or deactivates
a workflow, the process (whether leader or follower) that handles the
PATCH request and updates its internal state should send a message into
the command channel, so that all other main processes update their
internal state accordingly:

- Add to `ActiveWorkflows` if activating
- Remove from `ActiveWorkflows` if deactivating
- Remove and re-add to `ActiveWorkflows` if the update did not change
activation status.

After updating their internal state, if activating or deactivating, the
recipient main processes should push a message to all connected
frontends so that these can update their stores and so reflect the value
in the UI.

### Workflow activation errors

On failure to activate a workflow, the main instance should record the
error in Redis - main instances should always pull activation errors
from Redis in a multi-main scenario.

### Leadership change

On leadership change...

- The old leader should stop pruning and the new leader should start
pruning.
- The old leader should remove trigger- and poller-based workflows and
the new leader should add them.

packages/cli/src/eventbus/MessageEventBus/MessageEventBus.ts

@@ -32,7 +32,7 @@ import { ExecutionRepository } from '@db/repositories/execution.repository';
 import { WorkflowRepository } from '@db/repositories/workflow.repository';
 import type { AbstractEventMessageOptions } from '../EventMessageClasses/AbstractEventMessageOptions';
 import { getEventMessageObjectByType } from '../EventMessageClasses/Helpers';
-import { SingleMainInstancePublisher } from '@/services/orchestration/main/SingleMainInstance.publisher';
+import { SingleMainSetup } from '@/services/orchestration/main/SingleMainSetup';
 import { Logger } from '@/Logger';
 import { EventDestinationsRepository } from '@db/repositories/eventDestinations.repository';
 
@@ -207,9 +207,7 @@ export class MessageEventBus extends EventEmitter {
 		this.destinations[destination.getId()] = destination;
 		this.destinations[destination.getId()].startListening();
 		if (notifyWorkers) {
-			await Container.get(
-				SingleMainInstancePublisher,
-			).broadcastRestartEventbusAfterDestinationUpdate();
+			await Container.get(SingleMainSetup).broadcastRestartEventbusAfterDestinationUpdate();
 		}
 		return destination;
 	}
@@ -235,9 +233,7 @@ export class MessageEventBus extends EventEmitter {
 			delete this.destinations[id];
 		}
 		if (notifyWorkers) {
-			await Container.get(
-				SingleMainInstancePublisher,
-			).broadcastRestartEventbusAfterDestinationUpdate();
+			await Container.get(SingleMainSetup).broadcastRestartEventbusAfterDestinationUpdate();
 		}
 		return result;
 	}