RFR: 8356868: Not all cgroup parameters are made available

[Casper Norrbin]

Hi everyone,

This PR improves cgroup support by exposing additional parameters that are currently not available. These parameters would enable more advanced features that rely on CPU and memory usage data.

The new parameters are:

- CPU usage: `cpuacct.usage` (cgroup v1) and `cpu.stat` (cgroup v2), which allow precise tracking of consumed CPU time.

- Peak memory usage: `memory.peak` (cgroup v2). While the cgroup v1 equivalent (`memory.max_usage_in_bytes`) was already available, cgroup v2 previously returned `OSCONTAINER_ERROR` — this has now been fixed.

- Memory throttle limit: `memory.high` (cgroup v2). There is no direct equivalent in cgroup v1, but since most systems use cgroup v2, exposing this parameter enables finer-grained memory control for those systems.

Testing:
- All container tests under `/test/hotspot/jtreg/containers/`
- Manually inspected the new parameters in both cgroup v1 and v2 container environments with the relevant settings applied.

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Commit messages:
 - added cgroup parameters

Changes: https://git.openjdk.org/jdk/pull/25388/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25388&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8356868
  Stats: 163 lines in 10 files changed: 148 ins; 0 del; 15 mod
  Patch: https://git.openjdk.org/jdk/pull/25388.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25388/head:pull/25388

PR: https://git.openjdk.org/jdk/pull/25388