perf(editor): Improve performance when opening large workflows with node issues (#7901)

This PR should improve performance when opening large workflows that
contain node issues (Fixes ADO-1521)

**Background**
Main reason for this poor performance is that our `getCurrentWorkflow()`
store getter is unnecessarily heavy but on top of that we are calling it
more than we need. This addresses the second part of the issue by
changing the following:
- Pausing node issue processing while workflows are loading
- Only getting current workflow once (instead for every node) when
calling `refreshNodeIssues`

**Benchmark**
This was tested on a workflow attached to [this Linear
ticket](https://linear.app/n8n/issue/ADO-1501/deliveryhero-enterprise-instance-very-slow-loading-workflows)
and this fix brings down opening time from **~1m10s** to **~28s** on my
laptop.

**Tests**
- [Latest e2e tests
run](https://github.com/n8n-io/n8n/actions/runs/7060874994)

https://community.n8n.io/t/ui-very-slow-with-more-than-100-nodes/8236/14

packages/editor-ui/src/mixins/nodeHelpers.ts

@@ -91,6 +91,7 @@ export const nodeHelpers = defineComponent({
 		// Updates all the issues on all the nodes
 		refreshNodeIssues(): void {
 			const nodes = this.workflowsStore.allNodes;
+			const workflow = this.workflowsStore.getCurrentWorkflow();
 			let nodeType: INodeTypeDescription | null;
 			let foundNodeIssues: INodeIssues | null;
 
@@ -99,7 +100,7 @@ export const nodeHelpers = defineComponent({
 					return;
 				}
 				nodeType = this.nodeTypesStore.getNodeType(node.type, node.typeVersion);
-				foundNodeIssues = this.getNodeIssues(nodeType, node);
+				foundNodeIssues = this.getNodeIssues(nodeType, node, workflow);
 				if (foundNodeIssues !== null) {
 					node.issues = foundNodeIssues;
 				}
@@ -110,6 +111,7 @@ export const nodeHelpers = defineComponent({
 		getNodeIssues(
 			nodeType: INodeTypeDescription | null,
 			node: INodeUi,
+			workflow: Workflow,
 			ignoreIssues?: string[],
 		): INodeIssues | null {
 			const pinDataNodeNames = Object.keys(this.workflowsStore.getPinData || {});
@@ -147,7 +149,6 @@ export const nodeHelpers = defineComponent({
 					}
 				}
 
-				const workflow = this.workflowsStore.getCurrentWorkflow();
 				const nodeInputIssues = this.getNodeInputIssues(workflow, node, nodeType);
 				if (nodeIssues === null) {
 					nodeIssues = nodeInputIssues;