RFR: 8308843: Generational ZGC: Remove gc/z/TestHighUsage.java

[Albert Mingkun Yang]

On Tue, 8 Aug 2023 14:07:58 GMT, Axel Boldt-Christmas <aboldtch at openjdk.org> wrote:

> `gc/z/TestHighUsage.java` was originally used to test the high usage heuristics rule for single generational ZGC. For generational ZGC this test does not test anything concrete and mostly produces noise. So it should be removed.

Marked as reviewed by ayang (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/15192#pullrequestreview-1567420435