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/Interfaces.ts

@@ -298,6 +298,7 @@ export interface IDiagnosticInfo {
 	ldap_allowed: boolean;
 	saml_enabled: boolean;
 	binary_data_s3: boolean;
+	multi_main_setup_enabled: boolean;
 	licensePlanName?: string;
 	licenseTenantId?: number;
 }
@@ -469,7 +470,25 @@ export type IPushData =
 	| PushDataNodeDescriptionUpdated
 	| PushDataExecutionRecovered
 	| PushDataActiveWorkflowUsersChanged
-	| PushDataWorkerStatusMessage;
+	| PushDataWorkerStatusMessage
+	| PushDataWorkflowActivated
+	| PushDataWorkflowDeactivated
+	| PushDataWorkflowFailedToActivate;
+
+type PushDataWorkflowFailedToActivate = {
+	data: IWorkflowFailedToActivate;
+	type: 'workflowFailedToActivate';
+};
+
+type PushDataWorkflowActivated = {
+	data: IActiveWorkflowChanged;
+	type: 'workflowActivated';
+};
+
+type PushDataWorkflowDeactivated = {
+	data: IActiveWorkflowChanged;
+	type: 'workflowDeactivated';
+};
 
 type PushDataActiveWorkflowUsersChanged = {
 	data: IActiveWorkflowUsersChanged;
@@ -536,11 +555,24 @@ export interface IActiveWorkflowUser {
 	lastSeen: Date;
 }
 
+export interface IActiveWorkflowAdded {
+	workflowId: Workflow['id'];
+}
+
 export interface IActiveWorkflowUsersChanged {
 	workflowId: Workflow['id'];
 	activeUsers: IActiveWorkflowUser[];
 }
 
+interface IActiveWorkflowChanged {
+	workflowId: Workflow['id'];
+}
+
+interface IWorkflowFailedToActivate {
+	workflowId: Workflow['id'];
+	errorMessage: string;
+}
+
 export interface IPushDataExecutionRecovered {
 	executionId: string;
 }