Improve session cleanup (#18123)

- We move logging statements to the upper layer.
Store functions are low-level methods and should return error
upwards rather than logging.
- Used IN instead of any (array ()) which is equivalent.
- Made the delay to be of type time.Duration and un-exported it.
- Unexported the batch size constant.

```release-note
NONE
```

store/store.go

@@ -451,7 +451,7 @@ type SessionStore interface {
 	UpdateDeviceId(id string, deviceID string, expiresAt int64) (string, error)
 	UpdateProps(session *model.Session) error
 	AnalyticsSessionCount() (int64, error)
-	Cleanup(expiryTime int64, batchSize int64)
+	Cleanup(expiryTime int64, batchSize int64) error
 }
 
 type AuditStore interface {