[BUG][Workspace]Workspace routes unit tests failed

[wanglam]

Describe the bug

The unit tests of src/plugins/workspace/server/routes/index.test.ts was failed like below image:

The root cause was dynamicConfigServiceMock no longer export in ../../../../core/server/config after #7922

To Reproduce
Steps to reproduce the behavior:

1. Clone main branch code
2. Run yarn osd bootstrap
3. Run yarn test:jest src/plugins/workspace/server/routes/index.test.ts
4. All test cases will be failed

Expected behavior
All test cases should be passed

OpenSearch Version
N/A

Dashboards Version
Latest main branch

Plugins
N/A

Screenshots

Host/Environment (please complete the following information):

• OS: [e.g. iOS]
• Browser and version [e.g. 22]

Additional context

#4944