Remove dead code accessing unused simulation_id in measurement callback

[Copilot]

Addresses review feedback on PR #193 regarding unused code in the __onmeasurement callback method.

Changes

• Removed message["simulation_id"] access in Simulation.__onmeasurement() that extracted but never used the value
• The simulation ID is already stored as self.simulation_id when the simulation starts, making this extraction redundant

def __onmeasurement(self, headers, message):
    """Call the measurement callbacks"""
-   message["simulation_id"]  # Dead code
    timestamp = message["message"]["timestamp"]
    measurements = message["message"]["measurements"]
    for p in self.__filterable_measurement_callback_set:
        p[0](self, timestamp, measurements)

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