move open_model from init to run

[eacharles]

Change Description

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Solution Description

Code Quality

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• [ ] My code builds (or compiles) cleanly without any errors or warnings
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Bug Fix Checklist

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New Feature Checklist

• [ ] I have added or updated the docstrings associated with my feature using the NumPy docstring format
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• [ ] I have added unit/End-to-End (E2E) test cases to cover my new feature
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Documentation Change Checklist

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[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (b53de67) 100.00% compared to head (74504ae) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #8 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 2 2 Lines 301 303 +2 ========================================= + Hits 301 303 +2 ``` | [Files Changed](https://app.codecov.io/gh/LSSTDESC/rail_som/pull/8?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LSSTDESC) | Coverage Δ | | |---|---|---| | [src/rail/estimation/algos/minisom\_som.py](https://app.codecov.io/gh/LSSTDESC/rail_som/pull/8?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LSSTDESC#diff-c3JjL3JhaWwvZXN0aW1hdGlvbi9hbGdvcy9taW5pc29tX3NvbS5weQ==) | `100.00% <100.00%> (ø)` | | | [src/rail/estimation/algos/somoclu\_som.py](https://app.codecov.io/gh/LSSTDESC/rail_som/pull/8?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LSSTDESC#diff-c3JjL3JhaWwvZXN0aW1hdGlvbi9hbGdvcy9zb21vY2x1X3NvbS5weQ==) | `100.00% <100.00%> (ø)` | |

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