Merge functions that react to state change

[EZoni]

Overview

Merge the separate functions

• update_on_change_experiment
• update_on_change_model
• update_on_change_others

into a single function reset, which decides what to reset after inspecting state.modified_keys.

Notes

• Refactoring taken out of [WIP] Add control to select type of inputs displayed #356.
• When you review, it could be useful if you hide whitespaces.
• When you review, it could be good if you test the GUI features locally.

[Copilot]

Pull request overview

This pull request refactors state change handling by consolidating three separate callback functions into a single unified handler. The change is part of preparatory work extracted from PR #356, which adds a control to select the type of inputs displayed in the dashboard.

Changes:

• Merged three state change handlers (update_on_change_experiment, update_on_change_model, update_on_change_others) into a single reset function
• The new function uses conditional branching to determine appropriate reset actions based on which state variable changed
• All original functionality is preserved with identical reset behavior for each state variable

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[EZoni]

@RemiLehe

I think this PR is ready for review.