Ice tests fix

[AgnieszkaMakulska]

• correct soluble_fraction and mean_r values, to have large dust INPs like before
• improving plots in ice tests

[Copilot]

Pull request overview

This PR adjusts the long-test “ice” scenarios to use updated aerosol parameters (soluble fraction and mean radius) intended to restore prior INP behavior, and refines the generated diagnostic plots (layout, units, and output formats).

Changes:

• Update aerosol sol_frac and mean_r used by ice long tests to represent larger/less-soluble INPs.
• Simplify and restyle the “scheme comparison” ice plot (now liquid/ice only, km on y-axis, PDF output, shared legend).
• Improve the SD ice profile plot presentation (km axis, grid, Celsius conversion, PDF outputs).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
long_test/test_plot_schemes_ice.py	Updates aerosol params and revises scheme-comparison plotting to a 2-panel PDF with km scaling and shared legend.
long_test/test_plot_ice_SD.py	Updates plot styling/units, changes output files to PDF, and varies aerosol params per case.
long_test/test_ice_SD.py	Updates the aerosol parameters used for reference-consistency checks in the ice SD long test.

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