Withdrawn: 8351892: GenShen: Remove enforcement of generation sizes

[duke]

On Wed, 26 Mar 2025 23:50:41 GMT, William Kemper <wkemper at openjdk.org> wrote:

> * The option to configure minimum and maximum sizes for the young generation have been combined into `ShenandoahInitYoungPercentage`.
> * The remaining functionality in `shGenerationSizer` wasn't enough to warrant being its own class, so the functionality was rolled into `shGenerationalHeap`.

This pull request has been closed without being integrated.

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PR: https://git.openjdk.org/jdk/pull/24268