Add eslint warning about use of waitForTimeout to playwright eslint (W…

…ordPress#40802)

Co-authored-by: Glen Davies <[email protected]>

.eslintrc.js

@@ -258,6 +258,11 @@ module.exports = {
 						message:
 							'`$$` is discouraged, please use `locator` instead',
 					},
+					{
+						selector:
+							'CallExpression[callee.object.name="page"][callee.property.name="waitForTimeout"]',
+						message: 'Prefer page.locator instead.',
+					},
 				],
 			},
 		},