refactor: Switch plain errors in nodes-base to ApplicationError (no-changelog) (#7914)

Ensure all errors in `nodes-base` are `ApplicationError` or children of
it and contain no variables in the message, to continue normalizing all
the backend errors we report to Sentry. Also, skip reporting to Sentry
errors from user input and from external APIs. In future we should
refine `ApplicationError` to more specific errors.

Follow-up to: [#7877](https://github.com/n8n-io/n8n/pull/7877)

- [x] Test workflows:
https://github.com/n8n-io/n8n/actions/runs/7084627970
- [x] e2e: https://github.com/n8n-io/n8n/actions/runs/7084936861

---------

Co-authored-by: Michael Kret <michael.k@radency.com>

packages/nodes-base/nodes/Merge/v2/GenericFunctions.ts

@@ -1,3 +1,4 @@
+import { ApplicationError } from 'n8n-workflow';
 import type {
 	GenericValue,
 	IBinaryKeyData,
@@ -332,16 +333,18 @@ export function mergeMatched(
 
 export function checkMatchFieldsInput(data: IDataObject[]) {
 	if (data.length === 1 && data[0].field1 === '' && data[0].field2 === '') {
-		throw new Error(
+		throw new ApplicationError(
 			'You need to define at least one pair of fields in "Fields to Match" to match on',
+			{ level: 'warning' },
 		);
 	}
 	for (const [index, pair] of data.entries()) {
 		if (pair.field1 === '' || pair.field2 === '') {
-			throw new Error(
+			throw new ApplicationError(
 				`You need to define both fields in "Fields to Match" for pair ${index + 1},
 				 field 1 = '${pair.field1}'
 				 field 2 = '${pair.field2}'`,
+				{ level: 'warning' },
 			);
 		}
 	}
@@ -362,7 +365,10 @@ export function checkInput(
 			return get(entry.json, field, undefined) !== undefined;
 		});
 		if (!isPresent) {
-			throw new Error(`Field '${field}' is not present in any of items in '${inputLabel}'`);
+			throw new ApplicationError(
+				`Field '${field}' is not present in any of items in '${inputLabel}'`,
+				{ level: 'warning' },
+			);
 		}
 	}
 	return input;