Update illumination factor convention

[dhutererprats]

Description

Closes #

This PR standardizes naming from shadow-based terms to illumination-based terms in the RSO inspection/eclipsing paths.

Summary

• Renamed remaining internal usage to illumination naming:
  • min_illumination_factor
  • illuminationFactor
• Updated wording in RSO points module docs from shadowing to occlusion terminology.
• No intended behavior change; this is a naming/consistency cleanup.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How should this pull request be reviewed?

• By commit
• All changes at once

How Has This Been Tested?

• git grep -n -E "shadowFactor|min_shadow_factor|shadow_factor" src/bsk_rl tests/unittest (no matches)
• .venv/bin/python -m py_compile src/bsk_rl/scene/rso_points.py src/bsk_rl/sim/dyn/rso_inspection.py src/bsk_rl/utils/orbital.py
• Verified Basilisk fields exist in this environment (min_illumination_factor and illuminationFactor).

Note: full pytest execution in this sandbox is still blocked by local pandas binary policy.

Future Work

N/A

Checklist

• I have performed a self-review of my code
• I have commented my code in hard-to-understand areas
• I have made corresponding changes to the documentation and release notes
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works

[Mark2000]

Looks good! Could you add a note in the release notes alerting people to the change?