fix(changelog): mock changelog availability in the copilot payload test

Author: TheodoreSpeaks

apps/sim/lib/mothership/chat/payload.test.ts

@@ -57,6 +57,9 @@ vi.mock('@/lib/dashboards/application/availability', () => ({
 vi.mock('@/lib/workflow-tests/application/availability', () => ({
   readWorkflowTestAvailability: { execute: vi.fn(async () => false) },
 }))
+vi.mock('@/lib/changelog/application/availability', () => ({
+  readChangelogAvailability: { execute: vi.fn(async () => false) },
+}))
 vi.mock('@/lib/billing/core/subscription', () => billingSubscriptionMock)
 const mockGetHighestPrioritySubscription =
   billingSubscriptionMockFns.mockGetHighestPrioritySubscription