RFR: 8364351: ZGC: Replace usages of ZPageRange() with ZPageAgeRangeAll

[Joel Sikström]

Hello,

Following up on [JDK-8357053](https://bugs.openjdk.org/browse/JDK-8357053) and [JDK-8358586](https://bugs.openjdk.org/browse/JDK-8358586), this RFE adds a new pre-defined ZPageAge iterator called ZPageAgeRangeAll to iterate over all ages. ZPageAgeRangeAll replaces the usage of `ZPageAgeRange()`, and the ZPageAge gtest is expanded to cover this.

Testing:
* Oracle's tier 1-4

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Commit messages:
 - 8364351: ZGC: Replace usages of ZPageRange() with ZPageAgeRangeAll

Changes: https://git.openjdk.org/jdk/pull/26549/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26549&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8364351
  Stats: 14 lines in 7 files changed: 5 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/26549.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26549/head:pull/26549

PR: https://git.openjdk.org/jdk/pull/26549