Mm 16623 fix all initialism errors in channels/app and channels/api4 dir (#25743)

* updated go mod and sum files

* fixed var-naming errors in channels/app and channels/api4 dir

* Revert "updated go mod and sum files"

This reverts commit 088dd00a848c2c31952c29f0a2a28a9fb47fc3f7.

* renamed a cost .

server/channels/app/slashcommands/command_remote.go

@@ -279,10 +279,10 @@ func getRemoteClusterAutocompleteListItems(a *app.App, includeOffline bool) ([]m
 	return list, nil
 }
 
-func getRemoteClusterAutocompleteListItemsNotInChannel(a *app.App, channelId string, includeOffline bool) ([]model.AutocompleteListItem, error) {
+func getRemoteClusterAutocompleteListItemsNotInChannel(a *app.App, channelID string, includeOffline bool) ([]model.AutocompleteListItem, error) {
 	filter := model.RemoteClusterQueryFilter{
 		ExcludeOffline: !includeOffline,
-		NotInChannel:   channelId,
+		NotInChannel:   channelID,
 	}
 	all, err := a.GetAllRemoteClusters(filter)
 	if err != nil || len(all) == 0 {