test: update mock expiresAt to future date to pass CI

- Fixed unit tests failing due to immediate group expiration when expiresAt was in the past.
- Added missing heartbeatIntervalSeconds to mock responses.

Co-Authored-By: Gemini <noreply@google.com>

Author: takaokouji

test/unit/extension_mesh_v2_service.js

@@ -35,18 +35,22 @@ test('MeshV2Service Cost Tracking', t => {
                     id: 'g1',
                     name: 'G1',
                     domain: 'd1',
-                    expiresAt: '2026-01-01T00:00:00Z'
+                    expiresAt: '2099-01-01T00:00:00Z',
+                    heartbeatIntervalSeconds: 60
                 },
                 joinGroup: {
                     id: 'n1',
                     domain: 'd1',
-                    expiresAt: '2026-01-01T00:00:00Z'
+                    expiresAt: '2099-01-01T00:00:00Z',
+                    heartbeatIntervalSeconds: 120
                 },
                 renewHeartbeat: {
-                    expiresAt: '2026-01-01T00:00:00Z'
+                    expiresAt: '2099-01-01T00:00:00Z',
+                    heartbeatIntervalSeconds: 60
                 },
                 sendMemberHeartbeat: {
-                    expiresAt: '2026-01-01T00:00:00Z'
+                    expiresAt: '2099-01-01T00:00:00Z',
+                    heartbeatIntervalSeconds: 120
                 }
             }
         }),

test/unit/mesh_service_v2_global_vars.js

@@ -104,7 +104,8 @@ test('MeshV2Service Global Variables', t => {
                         id: 'group1',
                         name: 'groupName',
                         domain: 'domain1',
-                        expiresAt: '2025-12-30T12:00:00Z'
+                        expiresAt: '2099-01-01T00:00:00Z',
+                        heartbeatIntervalSeconds: 60
                     }
                 }
             }),