* better to exlude TimingTests and only run them in separate
job so that we see more easily when those fail in CI
(and lower prio to fix them in CI)
* BoundedBlockingQueueSpec has many timing sensitive things,
hardened it and marked as TimingTest
* -XX:+AlwaysActAsServerClassMachine in CI
* Remove GHExcludeTest from all tests, since we have included those in CI workflows
* Exclude a few failing tests from CI
* run CI with -Dakka.test.tags.exclude=gh-exclude again
* I noticed "command terminated with exit code 137" in some test failure,
and that is Kubernetes OOM kill.
* Container memory limit is 2Gi
* We didn't used more than 512M previously
