Delete all media after during teardown

Author: ockham

test/e2e/specs/editor/blocks/cover.spec.js

@@ -24,6 +24,10 @@ test.describe( 'Cover', () => {
 		await admin.createNewPost();
 	} );
 
+	test.afterAll( async ( { requestUtils } ) => {
+		await requestUtils.deleteAllMedia();
+	} );
+
 	test( 'can set overlay color using color picker on block placeholder', async ( {
 		editor,
 	} ) => {