Fix: Flaky RichText format e2e test (#76958)

Author: Mamaduka

test/e2e/specs/editor/various/rich-text.spec.js

@@ -104,7 +104,9 @@ test.describe( 'RichText (@firefox, @webkit)', () => {
 		editor,
 		pageUtils,
 	} ) => {
-		await page.keyboard.press( 'Enter' );
+		await editor.canvas
+			.locator( 'role=button[name="Add default block"i]' )
+			.click();
 		await pageUtils.pressKeys( 'primary+b' );
 		await page.keyboard.type( '1' );
 		await pageUtils.pressKeys( 'primary+b' );