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/cli/src/Server.ts

@@ -249,6 +249,7 @@ export class Server extends AbstractServer {
 			urlBaseWebhook,
 			urlBaseEditor: instanceBaseUrl,
 			versionCli: '',
+			isBetaRelease: config.getEnv('generic.isBetaRelease'),
 			oauthCallbackUrls: {
 				oauth1: `${instanceBaseUrl}/${this.restEndpoint}/oauth1-credential/callback`,
 				oauth2: `${instanceBaseUrl}/${this.restEndpoint}/oauth2-credential/callback`,