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/mixins/pushConnection.ts

@@ -291,6 +291,33 @@ export const pushConnection = defineComponent({
 				}
 			}
 
+			if (
+				receivedData.type === 'workflowFailedToActivate' &&
+				this.workflowsStore.workflowId === receivedData.data.workflowId
+			) {
+				this.workflowsStore.setWorkflowInactive(receivedData.data.workflowId);
+				this.workflowsStore.setActive(false);
+
+				this.showError(
+					new Error(receivedData.data.errorMessage),
+					this.$locale.baseText('workflowActivator.showError.title', {
+						interpolate: { newStateName: 'activated' },
+					}) + ':',
+				);
+
+				return true;
+			}
+
+			if (receivedData.type === 'workflowActivated') {
+				this.workflowsStore.setWorkflowActive(receivedData.data.workflowId);
+				return true;
+			}
+
+			if (receivedData.type === 'workflowDeactivated') {
+				this.workflowsStore.setWorkflowInactive(receivedData.data.workflowId);
+				return true;
+			}
+
 			if (receivedData.type === 'executionFinished' || receivedData.type === 'executionRecovered') {
 				// The workflow finished executing
 				let pushData: IPushDataExecutionFinished;