ci: Expand ESLint to tests in BE packages (no-changelog) (#6147)

* 🔧 Adjust base ESLint config

* 🔧 Adjust `lint` and `lintfix` in `nodes-base`

* 🔧 Include `test` and `utils` in `nodes-base`

* 📘 Convert JS tests to TS

* 👕 Apply lintfixes

packages/nodes-base/test/nodes/Stripe/helpers.test.ts

@@ -0,0 +1,30 @@
+const helpers = require('../../../nodes/Stripe/helpers');
+
+describe('adjustMetadata', () => {
+	it('it should adjust multiple metadata values', async () => {
+		const additionalFieldsValues = {
+			metadata: {
+				metadataProperties: [
+					{
+						key: 'keyA',
+						value: 'valueA',
+					},
+					{
+						key: 'keyB',
+						value: 'valueB',
+					},
+				],
+			},
+		};
+
+		const adjustedMetadata = helpers.adjustMetadata(additionalFieldsValues);
+
+		const expectedAdjustedMetadata = {
+			metadata: {
+				keyA: 'valueA',
+				keyB: 'valueB',
+			},
+		};
+		expect(adjustedMetadata).toStrictEqual(expectedAdjustedMetadata);
+	});
+});