RFR: 8297247: Add GarbageCollectorMXBean for Remark and Cleanup pause time in G1 [v4]

[Yude Lin]

On Fri, 2 Dec 2022 11:01:00 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Yude Lin has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Suggested changes to tests
>
> Sure, but we'll need a second reviewer. I'll ping others.

Thanks @tschatzl @albertnetymk . I'll create a second bug id for the minor issues brought up during the review.

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PR: https://git.openjdk.org/jdk/pull/11341