feat: view config feature flag (#13171)

* feat: add view_configurations feature flag

  - Add feature flag provider and hooks to admin dashboard
  - Add backend API endpoint for feature flags
  - Create view_configurations feature flag (disabled by default)
  - Update order list table to use legacy version when flag is disabled
  - Can be enabled with MEDUSA_FF_VIEW_CONFIGURATIONS=true env var

* fix: naming

* fix: feature flags unauthenticated

* fix: add test

integration-tests/http/__tests__/feature-flags/admin/feature-flags.spec.ts

@@ -0,0 +1,40 @@
+import { medusaIntegrationTestRunner } from "@medusajs/test-utils"
+import {
+  adminHeaders,
+  createAdminUser,
+} from "../../../../helpers/create-admin-user"
+
+jest.setTimeout(30000)
+
+medusaIntegrationTestRunner({
+  testSuite: ({ dbConnection, getContainer, api }) => {
+    describe("GET /admin/feature-flags", () => {
+      it("should return feature flags when unauthenticated", async () => {
+        const response = await api.get("/admin/feature-flags")
+
+        expect(response.status).toEqual(200)
+        expect(response.data).toHaveProperty("feature_flags")
+        expect(response.data.feature_flags).toEqual(
+          expect.objectContaining({
+            view_configurations: false,
+          })
+        )
+      })
+
+      it("should return feature flags when authenticated as admin", async () => {
+        const container = getContainer()
+        await createAdminUser(dbConnection, adminHeaders, container)
+
+        const response = await api.get("/admin/feature-flags", adminHeaders)
+
+        expect(response.status).toEqual(200)
+        expect(response.data).toHaveProperty("feature_flags")
+        expect(response.data.feature_flags).toEqual(
+          expect.objectContaining({
+            view_configurations: false,
+          })
+        )
+      })
+    })
+  },
+})