feat: Add If/Else node (#16833)

Closes [#1265](https://github.com/twentyhq/core-team-issues/issues/1265)

packages/twenty-server/src/engine/core-modules/feature-flag/constants/public-feature-flag.const.ts

@@ -20,6 +20,14 @@ export const PUBLIC_FEATURE_FLAGS: PublicFeatureFlag[] = [
       imagePath: 'https://twenty.com/images/lab/is-dashboards-enabled.png',
     },
   },
+  {
+    key: FeatureFlagKey.IS_IF_ELSE_ENABLED,
+    metadata: {
+      label: 'If/Else Workflow Node',
+      description: 'Enable if/else conditional branching in workflows',
+      imagePath: 'https://twenty.com/images/lab/is-if-else-enabled.png',
+    },
+  },
   ...(process.env.CLOUDFLARE_API_KEY
     ? [
         // {

packages/twenty-server/src/engine/core-modules/feature-flag/enums/feature-flag-key.enum.ts

@@ -15,4 +15,5 @@ export enum FeatureFlagKey {
   IS_TIMELINE_ACTIVITY_MIGRATED = 'IS_TIMELINE_ACTIVITY_MIGRATED',
   IS_ROW_LEVEL_PERMISSION_PREDICATES_ENABLED = 'IS_ROW_LEVEL_PERMISSION_PREDICATES_ENABLED',
   IS_WORKSPACE_CREATION_V2_ENABLED = 'IS_WORKSPACE_CREATION_V2_ENABLED',
+  IS_IF_ELSE_ENABLED = 'IS_IF_ELSE_ENABLED',
 }