feat(core): Improve health check (#6205)

* remove unnecesary Db re-initialization

this is from before we added `Db.init` in `WorkflowRunnerProcess`

* feat(core): Improved health check

* make health check not care about DB connections

* close DB connections, and shutdown the timer

packages/cli/src/WorkflowExecuteAdditionalData.ts

@@ -927,12 +927,6 @@ export async function getWorkflowData(
 
 	let workflowData: IWorkflowBase | null;
 	if (workflowInfo.id !== undefined) {
-		if (!Db.isInitialized) {
-			// The first time executeWorkflow gets called the Database has
-			// to get initialized first
-			await Db.init();
-		}
-
 		const relations = config.getEnv('workflowTagsDisabled') ? [] : ['tags'];
 
 		workflowData = await WorkflowsService.get({ id: workflowInfo.id }, { relations });