feat: UmbrellaSolver no longer hardcodes output format

[KSkwarczynski]

Pull request description

Umbrella Solver has been tuned using T2K/HK chains and older version and also only Osc.
Which means that output chain had hard-coded output. Now using ROOT magic output is no longer hard-coded and is simply copy of input one.

Examples

valid.pdf

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Memory and CPU Usage Summary

### Memory and CPU Usage Summary

| Metric  |     Mean    |      Max    |
|---------|-------------|-------------|
| **RAM** |   360.23 MB |   367.62 MB |
| **CPU** |    96.61 %  |    97.75 %  |

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