[jdk21u-dev] RFR: 8333326: Linux Alpine build fails after 8302744

[Jan Kratochvil]

A patch 2 of 6 for: [[21u] Backport intention of 8322420: [Linux] cgroup v2: Limits in parent nested control groups are not detected](https://mail.openjdk.org/pipermail/jdk-updates-dev/2025-April/043206.html)

It has a patch dependency on PR 1 of 6: https://github.com/openjdk/jdk21u-dev/pull/1648

This backport is clean.

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Commit messages:
 - 8333326: Linux Alpine build fails after 8302744
 - 8302744: Refactor Hotspot container detection code

Changes: https://git.openjdk.org/jdk21u-dev/pull/1649/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1649&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8333326
  Stats: 1266 lines in 10 files changed: 692 ins; 436 del; 138 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1649.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1649/head:pull/1649

PR: https://git.openjdk.org/jdk21u-dev/pull/1649