fix(Snowflake Node): Fix key-pair credentials (#16635)

Co-authored-by: Elias Meire <elias@meire.dev>
Co-authored-by: cubic-dev-ai[bot] <191113872+cubic-dev-ai[bot]@users.noreply.github.com>

packages/nodes-base/nodes/Snowflake/__tests__/GenericFunctions.test.ts

@@ -1,5 +1,9 @@
+import crypto from 'crypto';
+
 import { getConnectionOptions } from '../GenericFunctions';
 
+jest.mock('crypto');
+
 describe('getConnectionOptions', () => {
 	const commonOptions = {
 		account: 'test-account',
@@ -29,12 +33,43 @@ describe('getConnectionOptions', () => {
 		it('with private key for keyPair authentication', () => {
 			const result = getConnectionOptions({
 				...commonOptions,
+				username: 'test-username',
 				authentication: 'keyPair',
 				privateKey: 'test-private-key',
 			});
 
 			expect(result).toEqual({
 				...commonOptions,
+				username: 'test-username',
+				authenticator: 'SNOWFLAKE_JWT',
+				privateKey: 'test-private-key',
+			});
+		});
+
+		it('with private key for keyPair authentication and passphrase', () => {
+			const createPrivateKeySpy = jest.spyOn(crypto, 'createPrivateKey').mockImplementation(
+				() =>
+					({
+						export: () => 'test-private-key',
+					}) as unknown as crypto.KeyObject,
+			);
+			const result = getConnectionOptions({
+				...commonOptions,
+				username: 'test-username',
+				authentication: 'keyPair',
+				privateKey: 'encrypted-private-key',
+				passphrase: 'test-passphrase',
+			});
+
+			expect(createPrivateKeySpy).toHaveBeenCalledWith({
+				key: 'encrypted-private-key',
+				format: 'pem',
+				passphrase: 'test-passphrase',
+			});
+
+			expect(result).toEqual({
+				...commonOptions,
+				username: 'test-username',
 				authenticator: 'SNOWFLAKE_JWT',
 				privateKey: 'test-private-key',
 			});