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/editor-ui/src/stores/workflows.store.ts

@@ -10,7 +10,6 @@ import {
 } from '@/constants';
 import type {
 	ExecutionsQueryFilter,
-	IActivationError,
 	IExecutionDeleteFilter,
 	IExecutionPushResponse,
 	IExecutionResponse,
@@ -365,7 +364,7 @@ export const useWorkflowsStore = defineStore(STORES.WORKFLOWS, {
 			});
 		},
 
-		async getActivationError(id: string): Promise<IActivationError | undefined> {
+		async getActivationError(id: string): Promise<string | undefined> {
 			const rootStore = useRootStore();
 			return makeRestApiRequest(rootStore.getRestApiContext, 'GET', `/active/error/${id}`);
 		},
@@ -552,6 +551,9 @@ export const useWorkflowsStore = defineStore(STORES.WORKFLOWS, {
 			if (this.workflowsById[workflowId]) {
 				this.workflowsById[workflowId].active = true;
 			}
+			if (workflowId === this.workflow.id) {
+				this.setActive(true);
+			}
 		},
 
 		setWorkflowInactive(workflowId: string): void {
@@ -562,6 +564,9 @@ export const useWorkflowsStore = defineStore(STORES.WORKFLOWS, {
 			if (this.workflowsById[workflowId]) {
 				this.workflowsById[workflowId].active = false;
 			}
+			if (workflowId === this.workflow.id) {
+				this.setActive(false);
+			}
 		},
 
 		async fetchActiveWorkflows(): Promise<string[]> {