[FLINK-31174][doc] fix inconsistent data format between Learn-Flink Doc and flink-training-repo

[ChenZhongPu]

Due to the previous pr in which the data format of TaxiRide is changed, there is an inconsistency in Data Pipelines & ETL. To be specific,

• Since we cannot obtain startTime and endTime at the same time, I change the sample code to compute the (Euclidean) distance instead.
• I also conducted the experiment using the updated code with parallelism 4 to get the new sample output.
• Chinese translation is also updated.

Before:

 Interval rideInterval = new Interval(ride.startTime, ride.endTime);
 Minutes duration = rideInterval.toDuration().toStandardMinutes();
 out.collect(new Tuple2<>(ride.startCell, duration));

After:

double distance = ride.getEuclideanDistance(ride.startLon, ride.startLat);
out.collect(new Tuple2<>(ride.startCell, distance));

[flinkbot]

CI report:

• 8adeac4 Azure: SUCCESS

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