50803249 remove unnecessary keys in the json

Fix the json for bulk actions to have:
result:{
  tubes: [tube1, tube2, tube3]
}
instead of
result:{
  tubes: [{tube: tube1}, {tube: tube2}, {tube: tube3}]
}

AND

When we have in the json a parameter like "sample_uuid", the method recursively_load_uuid replaces it with "sample" and the core resource. In the case the resource cannot be found, we keep the information "sample_uuid" in the parameter.