Make FF_USE_NEW_BASH_EVAL_STRATEGY to be true by default

Assuming that the previous tests on GitLab.com runners confirmed that the new Bash script evaluation strategy works, we should set the FF_USE_NEW_BASH_EVAL_STRATEGY flag to be true by default. With this we will be able to test the behavior of the new Bash script evaluation strategy also on the self-hosted environments of our users, which should cover all possible scenarios.