Removing dead code

Removed unused GeneratePivotElement
Removed unused GetSiteAttachments
Removed unused GetMapIcons command
Removed unused field from GetReports
Removed unused GetUploadUrl command
Removed unused SearchResult class
Removed unused countInstances() method on ResourceLocator
Removed unused UploadAttachment command
Removed unused DTOs SearchHitDTOs, OrgUnitListResult
Removed unused /healthCheck endpoint