XYZ-35: Added Support for GlobalRelay Compliance Export Format

* Added username to ChannelMemberHistory struct in anticipation of supporting GlobalRelay in Compliance Export
* Removed translation from debug output - this makes it complicated to use utils functions from tests in the enterprise repo
* Added an advanced email function that allows for greater control over message details. Updated MessageExport config to support GlobalRelay. Added attachment support to InBucket unit tests
* Moving templates in from enterprise to solve test issues
* Added export format to diagnostics
* Changed email attachment code to use FileBackend so that S3 storage is properly supported

store/sqlstore/channel_member_history_store.go

@@ -110,7 +110,8 @@ func (s SqlChannelMemberHistoryStore) getFromChannelMemberHistoryTable(startTime
 	query := `
 			SELECT
 				cmh.*,
-				u.Email
+				u.Email,
+				u.Username
 			FROM ChannelMemberHistory cmh
 			INNER JOIN Users u ON cmh.UserId = u.Id
 			WHERE cmh.ChannelId = :ChannelId
@@ -130,9 +131,10 @@ func (s SqlChannelMemberHistoryStore) getFromChannelMemberHistoryTable(startTime
 func (s SqlChannelMemberHistoryStore) getFromChannelMembersTable(startTime int64, endTime int64, channelId string) ([]*model.ChannelMemberHistory, error) {
 	query := `
 		SELECT DISTINCT
-  			ch.ChannelId,
-  			ch.UserId,
-  			u.email
+			ch.ChannelId,
+			ch.UserId,
+			u.Email,
+			u.Username
 		FROM ChannelMembers AS ch
 		INNER JOIN Users AS u ON ch.UserId = u.id
 		WHERE ch.ChannelId = :ChannelId`
@@ -158,7 +160,7 @@ func (s SqlChannelMemberHistoryStore) PermanentDeleteBatch(endTime int64, limit
 			query =
 				`DELETE FROM ChannelMemberHistory
 				 WHERE ctid IN (
-				 	SELECT ctid FROM ChannelMemberHistory
+					SELECT ctid FROM ChannelMemberHistory
 					WHERE LeaveTime IS NOT NULL
 					AND LeaveTime <= :EndTime
 					LIMIT :Limit

store/sqlstore/compliance_store.go

@@ -225,7 +225,8 @@ func (s SqlComplianceStore) MessageExport(after int64, limit int) store.StoreCha
 				Channels.Id AS ChannelId,
 				Channels.DisplayName AS ChannelDisplayName,
 				Users.Id AS UserId,
-				Users.Email AS UserEmail
+				Users.Email AS UserEmail,
+				Users.Username
 			FROM
 				Posts
 				LEFT OUTER JOIN Channels ON Posts.ChannelId = Channels.Id