ChannelStore migration Part 3 (#15504)

* Migration finished

* Change error var name

* Fix imports

* Fix tests

* Merge with master

* Doing some suggestions

* More suggestions

* Fix i18n

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>
Co-authored-by: Agniva De Sarker <agnivade@yahoo.co.in>

services/telemetry/telemetry.go

@@ -1083,9 +1083,9 @@ func (ts *TelemetryService) trackGroups() {
 		mlog.Error(nErr.Error())
 	}
 
-	groupSyncedChannelCount, err := ts.dbStore.Channel().GroupSyncedChannelCount()
-	if err != nil {
-		mlog.Error(err.Error())
+	groupSyncedChannelCount, nErr := ts.dbStore.Channel().GroupSyncedChannelCount()
+	if nErr != nil {
+		mlog.Error(nErr.Error())
 	}
 
 	groupMemberCount, err := ts.dbStore.Group().GroupMemberCount()