skip maxwellian fn validation if from restart

Walkthrough

## Walkthrough The changes streamline the control flow in the simulation initialization process and the handling of restart conditions. The `__init__` method in the `maxwellian_fluid_model.py` now employs a clearer logic for validation based on whether the simulation is a dry run or a restart. In `simulation.py`, a new method `is_from_restart` has been added to encapsulate the conditions for determining restart scenarios, enhancing code maintainability and readability. ## Changes | Files | Change Summary | |------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------| | pyphare/.../maxwellian_fluid_model.py, pyphare/.../simulation.py | Modified control flow in `__init__` for validation logic; introduced `is_from_restart` method to improve clarity and maintainability in `start_time`. | ## Sequence Diagram(s) ```mermaid sequenceDiagram participant User participant Simulation participant MaxwellianFluidModel User->>Simulation: Start Simulation Simulation->>MaxwellianFluidModel: Initialize MaxwellianFluidModel->>Simulation: Check if dry run or restart Simulation-->>MaxwellianFluidModel: Return validation result MaxwellianFluidModel->>Simulation: Set up simulation ```

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PHAREHUB / PHARE

skip maxwellian fn validation if from restart #869

Summary by CodeRabbit