[crac] RFR: 8370888: [CRaC] Use better source of random for UUID generation in checkpoint path

[Timofei Pushkin]

On Thu, 30 Oct 2025 11:38:54 GMT, Radim Vansa <rvansa at openjdk.org> wrote:

> When `-XX:CRaCCheckpointTo` contains the `%u` placeholder to generate random UUID, it should use a different source than `os::random()` which provides not-seeded, deterministic values.

A test failed and it looks like it should rely on random to generate random directory names — can be related to the change somehow

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PR Comment: https://git.openjdk.org/crac/pull/271#issuecomment-3468345178