[MM-60083] export: do not export DMs/GMs if users are deleted (#28854)

server/public/model/utils.go

@@ -860,7 +860,7 @@ func IsCloud() bool {
 	return os.Getenv("MM_CLOUD_INSTALLATION_ID") != ""
 }
 
-func sliceToMapKey(s ...string) map[string]any {
+func SliceToMapKey(s ...string) map[string]any {
 	m := make(map[string]any)
 	for i := range s {
 		m[s[i]] = struct{}{}