RFR: 2512: Update windows version in github runner [v4]

[Erik Joelsson]

On Mon, 2 Jun 2025 20:31:52 GMT, Zhao Song <zsong at openjdk.org> wrote:

>> Update windows-2019 to windows-2022 in .github/ci.yml
>
> Zhao Song has updated the pull request incrementally with one additional commit since the last revision:
> 
>   update copyright

My idea was to try to execute `hg` once in `@BeforeClass` and if it failed, set a boolean to skip testcases with.

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PR Review: https://git.openjdk.org/skara/pull/1721#pullrequestreview-2889948317