ArduPilot / MethodicConfigurator / 27105744050

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fix(tempcal_imu): prevent ZeroDivisionError in IMU temperature interpolation on sensor stall

- Fix accel_at_temp (line 268): when two consecutive temperature readings
  are identical (T[i] == T[i+1]), division by zero occurs in interpolation.
  Fixed by checking delta_t == 0.0 and returning current value.

- Fix gyro_at_temp (line 280): same ZeroDivisionError for gyro data.
  Fixed with identical guard.

This can happen in real flight logs when the IMU sensor stalls and
reports the same temperature for consecutive readings.

Add two regression tests covering each crash scenario.

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