feat(core): Coordinate workflow activation in multiple main scenario in internal API (#7566)

Story: https://linear.app/n8n/issue/PAY-926

This PR coordinates workflow activation on instance startup and on
leadership change in multiple main scenario in the internal API. Part 3
on manual workflow activation and deactivation will be a separate PR.

### Part 1: Instance startup

In multi-main scenario, on starting an instance...
- [x] If the instance is the leader, it should add webhooks, triggers
and pollers.
- [x] If the instance is the follower, it should not add webhooks,
triggers or pollers.
- [x] Unit tests.

### Part 2: Leadership change 

In multi-main scenario, if the main instance leader dies…

- [x] The new main instance leader must activate all trigger- and
poller-based workflows, excluding webhook-based workflows.
- [x] The old main instance leader must deactivate all trigger- and
poller-based workflows, excluding webhook-based workflows.
- [x] Unit tests.

To test, start two instances and check behavior on startup and
leadership change:

```
EXECUTIONS_MODE=queue N8N_LEADER_SELECTION_ENABLED=true N8N_LICENSE_TENANT_ID=... N8N_LICENSE_ACTIVATION_KEY=... N8N_LOG_LEVEL=debug npm run start

EXECUTIONS_MODE=queue N8N_LEADER_SELECTION_ENABLED=true N8N_LICENSE_TENANT_ID=... N8N_LICENSE_ACTIVATION_KEY=... N8N_LOG_LEVEL=debug N8N_PORT=5679 npm run start
```

packages/cli/test/integration/shared/utils/index.ts

@@ -1,6 +1,6 @@
 import { Container } from 'typedi';
 import { BinaryDataService } from 'n8n-core';
-import type { INode } from 'n8n-workflow';
+import { type INode } from 'n8n-workflow';
 import { GithubApi } from 'n8n-nodes-base/credentials/GithubApi.credentials';
 import { Ftp } from 'n8n-nodes-base/credentials/Ftp.credentials';
 import { Cron } from 'n8n-nodes-base/nodes/Cron/Cron.node';
@@ -16,6 +16,8 @@ import { ActiveWorkflowRunner } from '@/ActiveWorkflowRunner';
 import { AUTH_COOKIE_NAME } from '@/constants';
 
 import { LoadNodesAndCredentials } from '@/LoadNodesAndCredentials';
+import { mockInstance } from './mocking';
+import { mockNodeTypesData } from '../../../unit/Helpers';
 
 export { mockInstance } from './mocking';
 export { setupTestServer } from './testServer';
@@ -166,3 +168,15 @@ export function makeWorkflow(options?: {
 }
 
 export const MOCK_PINDATA = { Spotify: [{ json: { myKey: 'myValue' } }] };
+
+export function setSchedulerAsLoadedNode() {
+	const nodesAndCredentials = mockInstance(LoadNodesAndCredentials);
+
+	Object.assign(nodesAndCredentials, {
+		loadedNodes: mockNodeTypesData(['scheduleTrigger'], {
+			addTrigger: true,
+		}),
+		known: { nodes: {}, credentials: {} },
+		types: { nodes: [], credentials: [] },
+	});
+}