RFR: 8364082: jdk/jfr/event/gc/heapsummary/TestHeapSummaryEventPSParOld.java Eden should be placed first in young

[Albert Mingkun Yang]

Update the test to reflect the new young-gen layout `from/to, eden` after [JDK-8338977](https://bugs.openjdk.org/browse/JDK-8338977).

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Commit messages:
 - pgc-fix-young-order

Changes: https://git.openjdk.org/jdk/pull/26466/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26466&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8364082
  Stats: 9 lines in 1 file changed: 1 ins; 1 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/26466.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26466/head:pull/26466

PR: https://git.openjdk.org/jdk/pull/26466