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/test/integration/commands/worker.cmd.test.ts

@@ -16,6 +16,7 @@ import { PostHogClient } from '@/posthog';
 import { RedisService } from '@/services/redis.service';
 import { OrchestrationHandlerWorkerService } from '@/services/orchestration/worker/orchestration.handler.worker.service';
 import { OrchestrationWorkerService } from '@/services/orchestration/worker/orchestration.worker.service';
+import { MultiMainSetup } from '@/services/orchestration/main/MultiMainSetup.ee';
 
 import { mockInstance } from '../../shared/mocking';
 
@@ -37,6 +38,7 @@ beforeAll(async () => {
 	mockInstance(RedisService);
 	mockInstance(RedisServicePubSubPublisher);
 	mockInstance(RedisServicePubSubSubscriber);
+	mockInstance(MultiMainSetup);
 });
 
 test('worker initializes all its components', async () => {