fix: Run dev command only for core packages (no-changelog) (#7928)

## Summary
Provide details about your pull request and what it adds, fixes, or
changes. Photos and videos are recommended.

- Filters out `@n8n/chat` and `n8n-design-system` from `pnpm run dev`
- Fixes dev/build error appearing due to code string `import ... from
'@n8n/chat'`

#### How to test the change:
1. `pnpm run dev` should work as expected
2. The command should not run for the two packages above
3. The error regarding `@n8n/chat` should no longer appear


## Issues fixed
Include links to Github issue or Community forum post or **Linear
ticket**:
> Important in order to close automatically and provide context to
reviewers


https://linear.app/n8n/issue/PAY-1089/run-dev-command-only-for-core-packages


## Review / Merge checklist
- [x] PR title and summary are descriptive. **Remember, the title
automatically goes into the changelog. Use `(no-changelog)` otherwise.**
([conventions](https://github.com/n8n-io/n8n/blob/master/.github/pull_request_title_conventions.md))
- [x] [Docs updated](https://github.com/n8n-io/n8n-docs) or follow-up
ticket created.
- [x] Tests included. N/A
> A bug is not considered fixed, unless a test is added to prevent it
from happening again. A feature is not complete without tests.
  >
> *(internal)* You can use Slack commands to trigger [e2e
tests](https://www.notion.so/n8n/How-to-use-Test-Instances-d65f49dfc51f441ea44367fb6f67eb0a?pvs=4#a39f9e5ba64a48b58a71d81c837e8227)
or [deploy test
instance](https://www.notion.so/n8n/How-to-use-Test-Instances-d65f49dfc51f441ea44367fb6f67eb0a?pvs=4#f6a177d32bde4b57ae2da0b8e454bfce)
or [deploy early access version on
Cloud](https://www.notion.so/n8n/Cloudbot-3dbe779836004972b7057bc989526998?pvs=4#fef2d36ab02247e1a0f65a74f6fb534e).

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

@@ -57,9 +57,10 @@ function indentLines(code: string, indent: string = '	') {
 		.join('\n');
 }
 
+const importCode = 'import';
 const commonCode = computed(() => ({
-	import: `import '@n8n/chat/style.css';
-import { createChat } from '@n8n/chat';`,
+	import: `${importCode} '@n8n/chat/style.css';
+${importCode} { createChat } from '@n8n/chat';`,
 	createChat: `createChat({
 	webhookUrl: '${webhookUrl.value}'
 });`,
@@ -69,7 +70,7 @@ import { createChat } from '@n8n/chat';`,
 const cdnCode = computed(
 	() => `<link href="https://cdn.jsdelivr.net/npm/@n8n/chat/style.css" rel="stylesheet" />
 <script type="module">
-import { createChat } from 'https://cdn.jsdelivr.net/npm/@n8n/chat/chat.bundle.es.js';
+${importCode} { createChat } from 'https://cdn.jsdelivr.net/npm/@n8n/chat/chat.bundle.es.js';
 
 ${commonCode.value.createChat}
 </${'script'}>`,
@@ -77,7 +78,7 @@ ${commonCode.value.createChat}
 
 const vueCode = computed(
 	() => `<script lang="ts" setup>
-import { onMounted } from 'vue';
+${importCode} { onMounted } from 'vue';
 ${commonCode.value.import}
 
 onMounted(() => {
@@ -87,7 +88,7 @@ ${indentLines(commonCode.value.createChat)}
 );
 
 const reactCode = computed(
-	() => `import { useEffect } from 'react';
+	() => `${importCode} { useEffect } from 'react';
 ${commonCode.value.import}
 
 export const App = () => {