function shouldKeepFixture(fixturePath, keep) {
  if (keep == null) return false;
  if (!Array.isArray(keep)) keep = [keep];
  if (keep?.length) {
    for (let glob of keep) {
      if (isGlobMatch(fixturePath, glob, {bash: true})) {
        return true;
      }
    }
  }
  return false;
}
Checks if the given fixture path matches any of the 'keep' globs.