[dotnet] store the mutated element for the user not just the target id - #12948

            var mutations = new List<IWebElement>();
            using IJavaScriptEngine monitor = new JavaScriptEngine(driver);
            monitor.DomMutated += (sender, e) =>
            {
                var locator = By.CssSelector($"*[data-__webdriver_id='{e.AttributeData.TargetId}']");
                mutations.Add(driver.FindElement(locator));
            };

            var mutations = new List<IWebElement>();
            using IJavaScriptEngine monitor = new JavaScriptEngine(driver);
            monitor.DomMutated += (sender, e) =>
            {
                mutations.Add(e.Element);
            };