[Workspace]Implement Permission Validation for get/bulkGet on Global Data Sources

[wanglam]

Is your feature request related to a problem? Please describe.

Currently, users can call get/bulkGet methods by data source ID for global data sources (not assigned to any workspace). This poses a security risk as users can potentially access and operate on global data sources that they should not have access to.

Describe the solution you'd like

I would like to add permission validation in the saved objects client wrapper's get or bulkGet methods. These methods should throw an error when a user attempts to operate on global data sources.

Describe alternatives you've considered

N/A

Additional context

#4944