feat: remove flag for modern layout

Author: eshankvaish

src/index.ts

@@ -101,10 +101,6 @@ export interface customEnv {
      * @default false
      */
     FEATURE_CODE_MIRROR_ENABLE?: boolean
-    /**
-     * If true, the experimental layout feature is enabled
-     */
-    FEATURE_EXPERIMENTAL_MODERN_LAYOUT_ENABLE?: boolean
     // ================== Feature flags for the enterprise release ==================
     /**
      * If true, only pipelines to which the user has access will be shown across the application