RFR: 8317358: G1: Make TestMaxNewSize use createTestJvm

[Leo Korinth]

On Mon, 2 Oct 2023 15:09:49 GMT, Leo Korinth <lkorinth at openjdk.org> wrote:

> In addition remove deprecated `Long(long)` constructor and rewrite `compareTo` to use `> 0` instead of `== 1`.
> 
> Also remove unused `isRunningG1(String[] args)` and `checkIncompatibleNewSize(String[] flags)`
> 
> Minimal testing completed, will run tier testing before pushing.

I have added `@key flag-sensitive`

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PR Comment: https://git.openjdk.org/jdk/pull/16012#issuecomment-1766256848