MM-27178: Use FileSettings.Directory in export tool (#15100)

* MM-27178: use FileSettings.Directory in export

* Set empty FileSettings.Directory to default value

* Validate that FileSettings.Directory is non-empty

* Don't set FileSettings.Directory to / in fixConfig

* Run make i18n-extract

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

cmd/mattermost/commands/export.go

@@ -206,6 +206,11 @@ func bulkExportCmdF(command *cobra.Command, args []string) error {
 	// Path to directory of custom emoji
 	pathToEmojiDir := "data/emoji/"
 
+	customDataDir := a.Config().FileSettings.Directory
+	if customDataDir != nil && *customDataDir != "" {
+		pathToEmojiDir = *customDataDir + "emoji/"
+	}
+
 	// Name of the directory to export custom emoji
 	dirNameToExportEmoji := "exported_emoji"