refactor: drop display: contents (#4348)

We have advanced panel which allows to set any value. No need to have
display: contents behind the flag anymore.

Author: TrySound

apps/builder/app/builder/features/style-panel/sections/layout/layout.tsx

@@ -1,5 +1,4 @@
 import { useState, type ReactNode } from "react";
-import { isFeatureEnabled } from "@webstudio-is/feature-flags";
 import {
   theme,
   Box,
@@ -465,10 +464,6 @@ const orderedDisplayValues = [
   "none",
 ];
 
-if (isFeatureEnabled("displayContents")) {
-  orderedDisplayValues.push("contents");
-}
-
 export const properties = [
   "display",
   "flexDirection",

packages/feature-flags/src/flags.ts

@@ -1,5 +1,4 @@
 // Only for development, is not supposed to be enabled at all.
-export const displayContents = false;
 export const internalComponents = false;
 export const unsupportedBrowsers = false;
 export const aiRadixComponents = false;