XYZ-110: Cherrypicking changes from release-4.7 to master (#8254)

* Cherry-picking 7b2861de3a to master because enterprise/master has code in it that enterprise/release-4.7 does not, and I don't want enterprise/master to break the next time somebody merges enterprise/release-4.7 to enterprise/master

* Renamed file to match existing scheme

(cherry picked from commit 8c22c5c6c6)

model/channel_member_history.go

@@ -8,8 +8,4 @@ type ChannelMemberHistory struct {
 	UserId    string
 	JoinTime  int64
 	LeaveTime *int64
-
-	// these two fields are never set in the database - when we SELECT, we join on Users to get them
-	UserEmail string `db:"Email"`
-	Username  string
 }

model/channel_member_history_result.go

@@ -0,0 +1,15 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package model
+
+type ChannelMemberHistoryResult struct {
+	ChannelId string
+	UserId    string
+	JoinTime  int64
+	LeaveTime *int64
+
+	// these two fields are never set in the database - when we SELECT, we join on Users to get them
+	UserEmail string `db:"Email"`
+	Username  string
+}