Replace InlineEntityFormTestBase::waitForElementRemoved with $assert_session->waitForElementRemoved
requested to merge issue/inline_entity_form-3183937:3183937-replace-inlineentityformtestbasewaitforelementremoved-with into 8.x-1.x
(cherry picked from commit 91be227641f187aa90e107257fd64d293bb562ac)
Closes #3183937