[SPARK-14625] TaskUIData and ExecutorUIData shouldn't be case classes #12386
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What changes were proposed in this pull request?
I was trying to understand the accumulator and metrics update source code and these two classes don't really need to be case classes. It would also be more consistent with other UI classes if they are not case classes. This is part of my bigger effort to simplify accumulators and task metrics.
How was this patch tested?
This is a straightforward refactoring without behavior change.