[crac] RFR: 8365143: [CRaC] CRaCIgnoreRestoreIfUnavailable tests do not check exit value

[Timofei Pushkin]

On Fri, 8 Aug 2025 12:06:08 GMT, Timofei Pushkin <tpushkin at openjdk.org> wrote:

> Adds missing exit value checks.

Turns out one of the tests has actually been failing on static build, Will look into it, looks like it fails because `crexec` is not a separate dynamic library in static builds.

Actually, the failure is not caused by this change. #255 and #257 just were merged separately and turns out they are conflicting (one of the tests was not prepared for a static build). So I am reopening this PR and will fix the failure separately.

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PR Comment: https://git.openjdk.org/crac/pull/260#issuecomment-3173409010
PR Comment: https://git.openjdk.org/crac/pull/260#issuecomment-3175062229