MM-36764 mlog refactor (#18118)

Refactor mlog
- simplify mlog by removing redundant code
- remove Zap dependency
- update unit test helpers
- update logging config
- update auditing

einterfaces/metrics.go

@@ -4,8 +4,8 @@
 package einterfaces
 
 import (
-	"github.com/mattermost/logr"
 	"github.com/mattermost/mattermost-server/v6/model"
+	"github.com/mattermost/mattermost-server/v6/shared/mlog"
 )
 
 type MetricsInterface interface {
@@ -66,7 +66,7 @@ type MetricsInterface interface {
 	ObservePluginAPIDuration(pluginID, apiName string, success bool, elapsed float64)
 
 	ObserveEnabledUsers(users int64)
-	GetLoggerMetricsCollector() logr.MetricsCollector
+	GetLoggerMetricsCollector() mlog.MetricsCollector
 
 	IncrementRemoteClusterMsgSentCounter(remoteID string)
 	IncrementRemoteClusterMsgReceivedCounter(remoteID string)

einterfaces/mocks/MetricsInterface.go

@@ -5,7 +5,7 @@
 package mocks
 
 import (
-	logr "github.com/mattermost/logr"
+	logr "github.com/mattermost/logr/v2"
 	mock "github.com/stretchr/testify/mock"
 
 	model "github.com/mattermost/mattermost-server/v6/model"