cli/command: remove deprecated CopyToFile utility

It was deprecated in 7cc6b8e, which is
part of v28.x

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit de54347)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Author: thaJeztah

cli/command/utils.go

@@ -14,24 +14,10 @@ import (
 	"github.com/docker/cli/cli/streams"
 	"github.com/docker/cli/internal/prompt"
 	"github.com/docker/docker/api/types/filters"
-	"github.com/moby/sys/atomicwriter"
 	"github.com/pkg/errors"
 	"github.com/spf13/pflag"
 )
 
-// CopyToFile writes the content of the reader to the specified file
-//
-// Deprecated: use [atomicwriter.New].
-func CopyToFile(outfile string, r io.Reader) error {
-	writer, err := atomicwriter.New(outfile, 0o600)
-	if err != nil {
-		return err
-	}
-	defer writer.Close()
-	_, err = io.Copy(writer, r)
-	return err
-}
-
 const ErrPromptTerminated = prompt.ErrTerminated
 
 // DisableInputEcho disables input echo on the provided streams.In.