[crac] Integrated: 8361090: [CRaC] Make dev engines less confusing

[Timofei Pushkin]

On Mon, 30 Jun 2025 17:21:50 GMT, Timofei Pushkin <tpushkin at openjdk.org> wrote:

> - Makes `pauseengine` Linux-only since it is not fully implemented on MacOS and Windows
>    - Also moves `criuengine` sources from `unix` to `linux` directory since it only supports Linux anyway
> - Makes `simengine` and `pausengine` report errors and status in more details

This pull request has now been integrated.

Changeset: f1e3b49d
Author:    Timofei Pushkin <tpushkin at openjdk.org>
URL:       https://git.openjdk.org/crac/commit/f1e3b49d8fdb0cd4eda8631118081e70b13b4db5
Stats:     250 lines in 7 files changed: 120 ins; 125 del; 5 mod

8361090: [CRaC] Make dev engines less confusing

Reviewed-by: rvansa

-------------

PR: https://git.openjdk.org/crac/pull/239