[crac] RFR: 8368570: [CRaC] Improve JdwpTransportTest [v5]

[Timofei Pushkin]

On Mon, 29 Sep 2025 13:57:16 GMT, Roman Marchenko <rmarchenko at openjdk.org> wrote:

>> JdwpTransportTest sometimes hangs, so it'd be good to dump Java threads, and create a corefile if possible.
>> 
>> Also improved reading from output stream.
>
> Roman Marchenko has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix review comment

LGTM.

It would be cool if sometime we would extend [the test failure handler](https://github.com/openjdk/crac/tree/crac/test/failure_handler) to gather this info from the child process then we would not need to do this on a per-test basis. But I am not very familiar with that code.

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Marked as reviewed by tpushkin (Committer).

PR Review: https://git.openjdk.org/crac/pull/265#pullrequestreview-3280347720