Updated notebooks for new error model.

[jfcrenshaw]

This PR updates the following tutorial notebooks to be consistent with the PR that adds the new rail.creation.degradation.lsst_error_model in rail_astro_tools:

• degradation demo
• photometric realization demo
• posterior demo
• pipe example
• golden spike

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (4743017) 100.00% compared to head (99c2147) 100.00%. Report is 8 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #60 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 1 1 Lines 1 1 ========================================= Hits 1 1 ```

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