fix: show actual clone metadata in the API instance status response (#309)

Description

Show actual clone metadata in the API instance status response

Related issue

#309 (closed)

Examples

GET /status

"metadata": {
  "cloningTime": 1.00857106, 
  "logicalSize": 4737804288, 
  "cloneDiffSize": 962560, 
  "maxIdleMinutes": 120
}

Checklist

• the MR description has been reviewed
• this MR contains text changes and they have been reviewed OR there are no texts changes
• this MR contains GUI/CLI changes and they have been reviewed OR there are no GUI/CLI changes
• this MR contains API changes, specifications reflect those changes and they have been reviewed OR there are no API changes