Skip test conditionally, based on element presence

During unplanned maintenance many applications display a maintenance popup. No mechanism currently exists to recognize that, in result scheduled tests execute as usual, fail, and send error alerts.
Workarounds using custom JS mark the test as "Failed" rather than "Skipped," which still triggers unwanted notifications.

Please add an assertion type that will prematurely end a test run on a condition;
if a condition is met, the test should immediately terminate with “Skipped” status, instead of failed.

An addition to skip test execution with code would also be useful.