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/src/Interfaces.ts

@@ -16,7 +16,6 @@ import type {
 	IWorkflowBase,
 	CredentialLoadingDetails,
 	Workflow,
-	WorkflowActivateMode,
 	WorkflowExecuteMode,
 	ExecutionStatus,
 	IExecutionsSummary,
@@ -64,20 +63,6 @@ import type {
 import type { LICENSE_FEATURES, LICENSE_QUOTAS } from './constants';
 import type { WorkflowWithSharingsAndCredentials } from './workflows/workflows.types';
 
-export interface IActivationError {
-	time: number;
-	error: {
-		message: string;
-	};
-}
-
-export interface IQueuedWorkflowActivations {
-	activationMode: WorkflowActivateMode;
-	lastTimeout: number;
-	timeout: NodeJS.Timeout;
-	workflowData: IWorkflowDb;
-}
-
 export interface ICredentialsTypeData {
 	[key: string]: CredentialLoadingDetails;
 }