completely remove drive caching layer from gateway days (#18217)

This has already been deprecated for close to a year now.

cmd/utils.go

@@ -702,37 +702,6 @@ func NewRemoteTargetHTTPTransport(insecure bool) func() *http.Transport {
 	}.NewRemoteTargetHTTPTransport(insecure)
 }
 
-// Load the json (typically from disk file).
-func jsonLoad(r io.ReadSeeker, data interface{}) error {
-	if _, err := r.Seek(0, io.SeekStart); err != nil {
-		return err
-	}
-	return json.NewDecoder(r).Decode(data)
-}
-
-// Save to disk file in json format.
-func jsonSave(f interface {
-	io.WriteSeeker
-	Truncate(int64) error
-}, data interface{},
-) error {
-	b, err := json.Marshal(data)
-	if err != nil {
-		return err
-	}
-	if err = f.Truncate(0); err != nil {
-		return err
-	}
-	if _, err = f.Seek(0, io.SeekStart); err != nil {
-		return err
-	}
-	_, err = f.Write(b)
-	if err != nil {
-		return err
-	}
-	return nil
-}
-
 // ceilFrac takes a numerator and denominator representing a fraction
 // and returns its ceiling. If denominator is 0, it returns 0 instead
 // of crashing.