BUG: evaluate parachute triggers once per time node (#1086)

[thatrandomasiandev]

Pull request type

• Code changes (bug fix, features)

Checklist

• Tests for the changes have been added (if needed)
• Docs have been reviewed and added / updated
• Lint (black rocketpy/ tests/ / make lint) has passed locally
• All tests (pytest tests -m slow --runslow) have passed locally
• CHANGELOG.md — no action needed; an LLM workflow auto-updates it after merge

Current behavior

Each time node evaluated parachute triggers twice: an inline loop in Flight.__simulate and again in __check_and_handle_parachute_triggers.

Fixes #1086

New behavior

The inline loop is removed; only __check_and_handle_parachute_triggers runs per node. Regression test asserts one call per sampled height.

Breaking change

• No

Additional information

Focused unit tests added/extended; full slow suite not run in this contribution pass.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.59%. Comparing base (e0ff281) to head (d062c37).
⚠️ Report is 49 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1121      +/-   ##
===========================================
+ Coverage    82.18%   82.59%   +0.41%     
===========================================
  Files          122      128       +6     
  Lines        16355    16603     +248     
===========================================
+ Hits         13441    13714     +273     
+ Misses        2914     2889      -25     

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