[scenes] Update scenes to be compatible with changes in SOFA regarding IntegrationScheme

[epernod]

No description provided.

[th-skam]

Let's see what regression tests do here.
We may need to do more than just this substitution to adjust to changes from SOFA.

[th-skam]

The regression now passes locally with impulseBased=True on the integration scheme. A fix on main sofa is needed for this to work; it's in a PR.

There are some remaining issues which we should revisit:

• In our non-regression tests, it's only the first and last states that are checked. I regenerated full references with v25.12. Intermediate states do not match that well even though final ones do. The scenes are not largely different but I can confirm that:
  • Our tolerance of 1e-7 is too strict (2 scenes pass with 1e-5).
  • The algorithm has diverged enough since v25.12 for this strict test.
• Locally I used SofaRegressionProgram in legacy mode. The legacy references store 6 significant digits. SofaRegressionProgram compares the full double-precision states against the rounded ones. More frames leads to higher noise. When the CI is ready to be used with the new JSON format and higher precision we should regenerate them.