Add H2 stress tests

[lorban]

Add H2 input and output stress test that uses client aborts and asserts that threads are not left stuck on locks.

Ideally, this test (and probably all other stress tests) should be ran at least once before every release; but probably they should be running nightly, and be excluded of PR builds. @olamy what's the current policy?

[wendigo]

Thanks, that exactly the issue we've been observing!

[joakime]

Ideally, this test (and probably all other stress tests) should be ran at least once before every release; but probably they should be running nightly, and be excluded of PR builds. @olamy what's the current policy?

Having the main branch builds (not PRs or other branches) run with @Tag("stress") is probably a good idea.
We could easily make the nightly builds run with them.
But I think a weekly build (over a Saturday) is probably a better choice. (to avoid other CI builds from impacting the stress test)

[olamy]

Setup done here https://jenkins.webtide.net/job/nightlies/job/stress/

12.0.x 12.1.x setup to run weekly (Jenkinsfile here https://github.com/webtide/jenkins-scripts/tree/main/nightlies/stress)

Build with this branch: https://jenkins.webtide.net/job/nightlies/job/stress/job/jetty-stress-run/12/