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

[Stefan Karlsson]

On Wed, 30 Jul 2025 12:15:34 GMT, Joel Sikström <jsikstro at openjdk.org> wrote:

> 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

Marked as reviewed by stefank (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/26549#pullrequestreview-3072057335