RFR: 8340408: Shenandoah: Remove redundant task stats printing code in ShenandoahTaskQueue

[William Kemper]

On Thu, 19 Sep 2024 00:33:04 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

> [JDK-8280397](https://bugs.openjdk.org/browse/JDK-8280397) made the code redundant. 
> 
> Adopt shared implementation.

Marked as reviewed by wkemper (Committer).

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PR Review: https://git.openjdk.org/jdk/pull/21077#pullrequestreview-2322876022