ENH: Add save functionality to _MonteCarloPlots.all method

[Copilot]

Pull request type

• Code changes (bugfix, features)

Checklist

• Tests for the changes have been added (if needed)
• Docs have been reviewed and added / updated
• Lint (black rocketpy/ tests/) has passed locally
• CHANGELOG.md has been updated (if relevant)

Current behavior

_MonteCarloPlots.all() can only display histograms interactively. No option to save to disk, unlike ellipses(save=True) and other plot methods in RocketPy that support filename parameter.

New behavior

Added filename parameter to _MonteCarloPlots.all() following the established pattern used in _FlightPlots:

• Uses show_or_save_plot() helper for consistent behavior
• When saving multiple keys, appends key name to filename stem (e.g., histogram.png → histogram_apogee.png)

# Save single histogram
monte_carlo.plots.all(keys="apogee", filename="output/histogram.png")
# → output/histogram_apogee.png

# Save multiple histograms
monte_carlo.plots.all(keys=["apogee", "x_impact"], filename="output/results.png")
# → output/results_apogee.png, output/results_x_impact.png

# Display without saving (unchanged)
monte_carlo.plots.all()

Breaking change

• No

Additional information

Closes #761

Also refactored _post_test_file_cleanup() in test file to use list-based approach for maintainability.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>ENH: Save _MonteCarloPlots.all plots to disk</issue_title>
<issue_description>Is your feature request related to a problem? Please describe.

The histograms generated by by MonteCarlo simulations (e.g. monte_carlo_simulation.plots.all()) cannot be saved because the function is missing a save boolean (like the ellipses function already has, e.g. monte_carlo_simulation.plots.ellipses(save=True)).

Describe the solution you'd like

Add save functionality to _MonteCarloPlots.all

Additional context

Other plots in RocketPy, e.g. _FlightPlots.linear_kinematics_data, have a filename parameter instead of a save boolean. Please consider whether it would make sense to adapt MonteCarlo-related plot functions to allow specifying the filename as well.
</issue_description>

<agent_instructions>Please read the instructions file. Check out the rocketpy/plots folder to understand how we organize our plots.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@Gui-FernandesBR @nalquas copilot has opened a PR to tackle this issue. Let's follow #848 now

• Fixes ENH: Save _MonteCarloPlots.all plots to disk #847

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[Gui-FernandesBR]

@copilot please add this PR to the CHANGELOG.md file!

[Copilot]

@copilot please add this PR to the CHANGELOG.md file!

Added to CHANGELOG.md in commit 92a4f36.

[Gui-FernandesBR]

LGTM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.37%. Comparing base (9cf3dd4) to head (92a4f36).
⚠️ Report is 10 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #884      +/-   ##
===========================================
+ Coverage    80.27%   80.37%   +0.09%     
===========================================
  Files          104      106       +2     
  Lines        12769    13007     +238     
===========================================
+ Hits         10250    10454     +204     
- Misses        2519     2553      +34     

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[Gui-FernandesBR]

Amazing!