Rclone - Allow to continue workflow by ignoring lines from stderr with a regex

[p-bizouard]

• Add a field in BackupConfiguration to set a regex to ignore errors dumped on stderr
• If the field is valued and the error output is empty after ignoring lines, the command should be considered as success

It will allow to backup object storages with files name > 255 chars on a filesystem that does not support this, and consider the backup as a success even if few files were not backuped

[p-bizouard]

Fixed in 8220765