Add mount_count and unmount_count tracking for samples

Introduced `mount_count` and `unmount_count` fields to track mounting events for samples. Updated models, schemas, and front-end components to support dynamic calculation and display of these counts. Enhanced backend queries and API responses to include the new data.

backend/app/schemas.py

@@ -424,6 +424,9 @@ class Sample(BaseModel):
     comments: Optional[str] = None
     data_collection_parameters: Optional[DataCollectionParameters]
     events: List[SampleEventResponse] = []
+    mount_count: Optional[int] = None
+    unmount_count: Optional[int] = None
+    # results: Optional[Results] = None
 
     class Config:
         from_attributes = True