Add ability to bulk import emoji (#9048)

* Add ability to bulk import emoji

* Improve error handling

* Update test config

model/emoji.go

@@ -41,11 +41,15 @@ func (emoji *Emoji) IsValid() *AppError {
 		return NewAppError("Emoji.IsValid", "model.emoji.update_at.app_error", nil, "id="+emoji.Id, http.StatusBadRequest)
 	}
 
-	if len(emoji.CreatorId) != 26 {
+	if len(emoji.CreatorId) > 26 {
 		return NewAppError("Emoji.IsValid", "model.emoji.user_id.app_error", nil, "", http.StatusBadRequest)
 	}
 
-	if len(emoji.Name) == 0 || len(emoji.Name) > EMOJI_NAME_MAX_LENGTH || !IsValidAlphaNumHyphenUnderscore(emoji.Name, false) || inSystemEmoji(emoji.Name) {
+	return IsValidEmojiName(emoji.Name)
+}
+
+func IsValidEmojiName(name string) *AppError {
+	if len(name) == 0 || len(name) > EMOJI_NAME_MAX_LENGTH || !IsValidAlphaNumHyphenUnderscore(name, false) || inSystemEmoji(name) {
 		return NewAppError("Emoji.IsValid", "model.emoji.name.app_error", nil, "", http.StatusBadRequest)
 	}