[jdk23] RFR: 8334719: (se) Deferred close of SelectableChannel may result in a Selector doing the final close before concurrent I/O on channel has completed

[Jaikiran Pai]

I would like to backport this bug fix for a P3 issue into jdk23 branch. The backport is clean and the original fix was reviewed in mainline https://github.com/openjdk/jdk/pull/19879.

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Commit messages:
 - Backport 9bb675f89dd1eeec423ca96cb3f96d29f5de477c

Changes: https://git.openjdk.org/jdk/pull/19920/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19920&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8334719
  Stats: 705 lines in 7 files changed: 705 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/19920.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19920/head:pull/19920

PR: https://git.openjdk.org/jdk/pull/19920