Autotests: Replace Clear canvas operations with valid helper function

[AlexeyGirin]

Identify allClear canvas operations made by keyboard Control+Delete and by using methods selectTopPanelButton(TopPanelButton.Clear, page);
and replace them with selectClearCanvasTool(page); method

Recommendation: Try to search "page.keyboard.press(" in code
That could be page.keyboard.press('Control+Delete');
or page.keyboard.press('${modifier}+Delete'); or similar