GitLab

* enable parallel tests

* disable parallelism for GPU tests

* [test] limit maximum processes on linux

* [debug] limit max processes even further

* [test] use subprocesses over threads

* [test] limit intra-op threads

* only limit intra op threads for CPU tests

* [poc] use low timeout for showcasing

* [poc] fix syntax

* set timeout to 5 minutes

* fix timeout on windows
Co-authored-by: Francisco Massa <fvsmassa@gmail.com>