ci: Fix lint in nodes-base to fix build (no-changelog) (#7966)

## Summary
We recently merged the `no-plain-errors` rule and one instance seems to
have slipped through.

Ref: https://github.com/n8n-io/n8n/pull/7961

...

#### How to test the change:
1. ...


## 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

...


## Review / Merge checklist
- [ ] 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))
- [ ] [Docs updated](https://github.com/n8n-io/n8n-docs) or follow-up
ticket created.
- [ ] Tests included.
> 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
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packages/nodes-base/nodes/Transform/utils/utils.ts

@@ -1,3 +1,5 @@
+import { ApplicationError } from 'n8n-workflow';
+
 export const prepareFieldsArray = (fields: string | string[], fieldName = 'Fields') => {
 	if (typeof fields === 'string') {
 		return fields
@@ -8,7 +10,8 @@ export const prepareFieldsArray = (fields: string | string[], fieldName = 'Field
 	if (Array.isArray(fields)) {
 		return fields;
 	}
-	throw new Error(
+	throw new ApplicationError(
 		`The \'${fieldName}\' parameter must be a string of fields separated by commas or an array of strings.`,
+		{ level: 'warning' },
 	);
 };