Replace deprecated ioutil with io and os (#20776)

* Replace ioutil with io and os

* Replace ioutil in utils/file.go

* Minor fix to tests and excluded files

Co-authored-by: Tim Scheuermann <tim.scheuermann@mattermost.com>
Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

shared/mlog/global_test.go

@@ -6,7 +6,6 @@ package mlog_test
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -99,7 +98,7 @@ func TestLoggingAfterInitialized(t *testing.T) {
 		t.Run(testCase.description, func(t *testing.T) {
 			var filePath string
 			if testCase.cfg.Type == "file" {
-				tempDir, err := ioutil.TempDir(os.TempDir(), "TestLoggingAfterInitialized")
+				tempDir, err := os.MkdirTemp(os.TempDir(), "TestLoggingAfterInitialized")
 				require.NoError(t, err)
 				defer os.Remove(tempDir)
 
@@ -122,7 +121,7 @@ func TestLoggingAfterInitialized(t *testing.T) {
 			logger.Shutdown()
 
 			if testCase.cfg.Type == "file" {
-				logs, err := ioutil.ReadFile(filePath)
+				logs, err := os.ReadFile(filePath)
 				require.NoError(t, err)
 
 				actual := strings.TrimSpace(string(logs))

shared/mlog/mlog.go

@@ -10,7 +10,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"os"
 	"strings"
@@ -181,12 +180,14 @@ func NewLogger(options ...Option) (*Logger, error) {
 
 // Configure provides a new configuration for this logger.
 // Zero or more sources of config can be provided:
-//   cfgFile    - path to file containing JSON
-//   cfgEscaped - JSON string probably from ENV var
+//
+//	cfgFile    - path to file containing JSON
+//	cfgEscaped - JSON string probably from ENV var
 //
 // For each case JSON containing log targets is provided. Target name collisions are resolved
 // using the following precedence:
-//     cfgFile > cfgEscaped
+//
+//	cfgFile > cfgEscaped
 //
 // An optional set of factories can be provided which will be called to create any target
 // types or formatters not built-in.
@@ -199,7 +200,7 @@ func (l *Logger) Configure(cfgFile string, cfgEscaped string, factories *Factori
 
 	// Add config from file
 	if cfgFile != "" {
-		b, err := ioutil.ReadFile(cfgFile)
+		b, err := os.ReadFile(cfgFile)
 		if err != nil {
 			return fmt.Errorf("error reading logger config file %s: %w", cfgFile, err)
 		}