Fix `test-linux-stable` excessive run time (#13597)

* ci-cd#754:Fix slow unit tests

 - Add nextest config
 - Add slow tests to mutual exclusion list

* Update .config/nextest.toml

Co-authored-by: Alexander Samusev <41779041+alvicsam@users.noreply.github.com>

---------

Co-authored-by: Alexander Samusev <41779041+alvicsam@users.noreply.github.com>