[jdk24] RFR: 8347542: Gatherers.mapConcurrent exhibits undesired behavior under variable delays, interruption, and finishing

[Viktor Klang]

Backport to jdk24 of https://bugs.openjdk.org/browse/JDK-8347274

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Commit messages:
 - 8347274: Gatherers.mapConcurrent exhibits undesired behavior under variable delays, interruption, and finishing

Changes: https://git.openjdk.org/jdk/pull/23068/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23068&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8347542
  Stats: 148 lines in 2 files changed: 93 ins; 16 del; 39 mod
  Patch: https://git.openjdk.org/jdk/pull/23068.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23068/head:pull/23068

PR: https://git.openjdk.org/jdk/pull/23068