chore: remove deprecated "io/ioutil" imports (#25119)

Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>

server/cmd/mmctl/commands/sampledata.go

@@ -8,7 +8,6 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"math/rand"
 	"os"
 	"path/filepath"
@@ -158,8 +157,8 @@ func processProfileImagesDir(profileImagesPath, tmpDir, bulk string) ([]string,
 	if !profileImagesStat.IsDir() {
 		return nil, fmt.Errorf("profile-images parameters must be a directory")
 	}
-	var profileImagesFiles []os.FileInfo
-	profileImagesFiles, err = ioutil.ReadDir(profileImagesPath)
+
+	profileImagesFiles, err := os.ReadDir(profileImagesPath)
 	if err != nil {
 		return nil, fmt.Errorf("invalid profile-images parameter: %w", err)
 	}
@@ -223,7 +222,7 @@ func sampledataCmdF(c client.Client, command *cobra.Command, args []string) erro
 	var err error
 	switch bulk {
 	case "":
-		tmpDir, err = ioutil.TempDir("", "mmctl-sampledata-")
+		tmpDir, err = os.MkdirTemp("", "mmctl-sampledata-")
 		if err != nil {
 			return fmt.Errorf("unable to create temporary directory")
 		}