`Restart` experiment (or realization) from GUI does unexpected things

[dafeda]

Describe the bug A clear and concise description of what the bug is.

To reproduce Steps to reproduce the behaviour:

1. pip install ert
2. Modify poly_eval.py such that some realizations fail:

#!/usr/bin/env python3
import json
import random

def _load_coeffs(filename):
    with open(filename, encoding="utf-8") as f:
        return json.load(f)["COEFFS"]


def _evaluate(coeffs, x):
    return coeffs["a"] * x**2 + coeffs["b"] * x + coeffs["c"]


if __name__ == "__main__":
    if random.random() > 0.5:
        raise ValueError("Failed realization.")
    coeffs = _load_coeffs("parameters.json")
    output = [_evaluate(coeffs, x) for x in range(10)]
    with open("poly.out", "w", encoding="utf-8") as f:
        f.write("\n".join(map(str, output)))

3. Run Ensemble experiment About 50% of realizations should fail:

4. Hit Restart Notice that only the failed realizations remain:

Also, at this stage, we have two experiments and two ensembles in the storage:

➜  poly_example git:(main) ✗ tree storage -L 2
storage
├── ensembles
│   ├── 8779c158-35ed-408a-b41b-32646e95af59
│   └── b6e6e80e-a22a-4ff0-8b92-7329f82110f9
├── experiments
│   ├── 3f4e4c2c-ef44-4f8a-a3e0-acf8d146a186
│   └── e820f829-afe6-4444-b64e-b9afee588759
├── index.json
├── storage.lock
└── storage_server.json

Expected behaviour I expect Restart to restart only the failed realizations and keep the successful ones. I also expect the restart to happen in the same experiment and in the same ensemble, i.e., no new experiments or ensembles should be created.