add missed search decorator

[etiennejouan]

No description provided.

[greptile-apps]

PR Summary

Added the missing @WorkspaceIsSearchable() decorator to the WorkspaceMemberWorkspaceEntity class, enabling proper search functionality for workspace members.

• The entity already had search capabilities with a searchVector field and defined SEARCH_FIELDS_FOR_WORKSPACE_MEMBER but lacked the required decorator
• This fix ensures workspace members will now properly appear in search results throughout the application
• The decorator works with the existing search vector field to enable full-text search capabilities for member records

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[bosiraphael]

LGTM