Merge "aconfig: don't fail if a proto file is missing" into main

    let paths = aconfig_device_paths::parsed_flags_proto_paths()?;

    for path in paths {

        let bytes = fs::read(path.clone())?;

        let Ok(bytes) = fs::read(&path) else {

            eprintln!("warning: failed to read {:?}", path);

            continue;

        };

        let parsed_flags: ProtoParsedFlags = protobuf::Message::parse_from_bytes(&bytes)?;

        for flag in parsed_flags.parsed_flag {

            // TODO(b/334954748): enforce one-container-per-flag invariant.