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

[William Kemper]

Clean backport.

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Commit messages:
 - Backport 279086d4ce7e05972e099022e8045f39680dd4e8

Changes: https://git.openjdk.org/shenandoah-jdk21u/pull/123/files
  Webrev: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=123&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340408
  Stats: 49 lines in 4 files changed: 0 ins; 47 del; 2 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/123.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/123/head:pull/123

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/123