[crac] RFR: 8351402: [CRaC] Use System.nanoTime() in TimedWaitingTest

[duke]

On Fri, 7 Mar 2025 12:15:50 GMT, Timofei Pushkin <tpushkin at openjdk.org> wrote:

> Replaces `System.currentTimeMillis()` with `System.nanoTime()` in `TimedWaitingTest` since the former can, in theory, jump back and forth and that may lead to the test failures.
> 
> Also adds a diagnostic assert.

@TimPushkin 
Your change (at version 2f1a1e148208b567232cdaed4346b72fb662d3d3) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/crac/pull/209#issuecomment-2706333827