[MM-31398] upgrade error level to critical in case of panic or os.Exit (#16584)

* upgrade error level to critical in case of panic or os.Exit

* reflect revivew comments

* fix error capitalization

api4/apitestlib.go

@@ -609,9 +609,6 @@ func (th *TestHelper) CreateDmChannel(user *model.User) *model.Channel {
 	var err *model.AppError
 	var channel *model.Channel
 	if channel, err = th.App.GetOrCreateDirectChannel(th.BasicUser.Id, user.Id); err != nil {
-		mlog.Error(err.Error())
-
-		time.Sleep(time.Second)
 		panic(err)
 	}
 	utils.EnableDebugLogForTest()
@@ -675,9 +672,6 @@ func (th *TestHelper) UpdateActiveUser(user *model.User, active bool) {
 
 	_, err := th.App.UpdateActive(user, active)
 	if err != nil {
-		mlog.Error(err.Error())
-
-		time.Sleep(time.Second)
 		panic(err)
 	}
 
@@ -689,9 +683,6 @@ func (th *TestHelper) LinkUserToTeam(user *model.User, team *model.Team) {
 
 	err := th.App.JoinUserToTeam(team, user, "")
 	if err != nil {
-		mlog.Error(err.Error())
-
-		time.Sleep(time.Second)
 		panic(err)
 	}
 
@@ -703,9 +694,6 @@ func (th *TestHelper) AddUserToChannel(user *model.User, channel *model.Channel)
 
 	member, err := th.App.AddUserToChannel(user, channel)
 	if err != nil {
-		mlog.Error(err.Error())
-
-		time.Sleep(time.Second)
 		panic(err)
 	}
 
@@ -992,9 +980,6 @@ func (th *TestHelper) UpdateUserToTeamAdmin(user *model.User, team *model.Team)
 		}
 	} else {
 		utils.EnableDebugLogForTest()
-		mlog.Error(err.Error())
-
-		time.Sleep(time.Second)
 		panic(err)
 	}
 
@@ -1012,9 +997,6 @@ func (th *TestHelper) UpdateUserToNonTeamAdmin(user *model.User, team *model.Tea
 		}
 	} else {
 		utils.EnableDebugLogForTest()
-		mlog.Error(err.Error())
-
-		time.Sleep(time.Second)
 		panic(err)
 	}