RFR: 8355298: Increase timeout for StressAsyncUL

[Aleksey Shipilev]

On Mon, 9 Jun 2025 14:01:17 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

> Hi,
> 
> Running async UL with stalling mode enabled is very slow if your buffer is very small. This turns out to become an issue on slow machines, where we run the risk of the test timing out.
> 
> The ticket's suggestion (and title) is to increase the timeout. I think that it'd be fine to reduce the logging level to 'debug' instead, thus reducing the time required to run the test.
> 
> Obviously, if we go with this solution then the ticket name and description must be adjusted.

I think it is fine to switch to `debug`, if that indeed produces much fewer messages, while still testing the stalling mode.

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PR Review: https://git.openjdk.org/jdk/pull/25695#pullrequestreview-2925570815