fix(content): fix root.startups key (2)

[revolunet]

Suite de #20757

Pour les personnes qui ont + de 1 mission et une clé root.startups, ajoute root.startups dans la derniere mission si la SE n'est pas déjà dans une des missions

authorsFiles.forEach(async (file) => {
  const header = await getMarkdownFileHeader(path.join(authorsPath, file));
  if (header.data.startups && header.data.startups.length && header.data.missions && header.data.missions.length) {
    const missionsStartups = header.data.missions.flatMap((m) => m.startups || []);
    const rootStartups = header.data.startups;
    const lastMission = header.data.missions[header.data.missions.length - 1];
    if (Array.from(missionsStartups).length === 0) {
      lastMission.startups = rootStartups.sort();
    } else {
      const missingStartups = rootStartups.filter((x) => !missionsStartups.includes(x));
      lastMission.startups = uniq([...(lastMission.startups || []), ...missingStartups].sort());
    }
    delete header.data.startups;
    const doc = dumpYaml(header.data, header.content);
    fs.writeFileSync(path.join(authorsPath, file), doc);
  }
});