RFR: 8338444: Shenandoah: Remove ShenandoahHumongousThreshold tunable

[Y. Srinivas Ramakrishna]

On Thu, 15 Aug 2024 11:10:03 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> See the bug for rationale.
> 
> Additional testing:
>   - [x] Linux AArch64 server fastdebug, `hotspot_gc_shenandoah`
>   - [x] Linux AArch64 server fastdebug, `all` with `-XX:+UseShenandoahGC`

Marked as reviewed by ysr (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/20593#pullrequestreview-2240762386