feat(core): Add support for building LLM applications (#7235)

This extracts all core and editor changes from #7246 and #7137, so that
we can get these changes merged first.

ADO-1120

[DB Tests](https://github.com/n8n-io/n8n/actions/runs/6379749011)
[E2E Tests](https://github.com/n8n-io/n8n/actions/runs/6379751480)
[Workflow Tests](https://github.com/n8n-io/n8n/actions/runs/6379752828)

---------

Co-authored-by: Jan Oberhauser <jan.oberhauser@gmail.com>
Co-authored-by: Oleg Ivaniv <me@olegivaniv.com>
Co-authored-by: Alex Grozav <alex@grozav.com>
Co-authored-by: कारतोफ्फेलस्क्रिप्ट™ <aditya@netroy.in>

packages/editor-ui/src/components/NodeSettingsTabs.vue

@@ -20,6 +20,7 @@ import type { INodeUi, ITab } from '@/Interface';
 import { useNDVStore } from '@/stores/ndv.store';
 import { useWorkflowsStore } from '@/stores/workflows.store';
 import type { INodeTypeDescription } from 'n8n-workflow';
+import { NodeConnectionType } from 'n8n-workflow';
 
 import { isCommunityPackageName } from '@/utils';
 
@@ -130,7 +131,7 @@ export default defineComponent({
 					node_type: this.activeNode.type,
 					workflow_id: this.workflowsStore.workflowId,
 					session_id: this.sessionId,
-					pane: 'main',
+					pane: NodeConnectionType.Main,
 					type: 'docs',
 				});
 			}