Display failing tests again

[Chemaclass]

📚 Description

Closes: #294

🔖 Changes

• Better handler runtime errors
• Have control over the single-test-outcomes
  • Do not use FD 3 when executing the test function. Instead, add the test output to the subshell context
• Save the failing tests into a temporal file so that we can render them at the end of the runner

🖼️ Demo

✅ To-do list

• I updated the CHANGELOG.md to reflect the new feature or fix
• I updated the documentation to reflect the changes

[jorge-ramirez-purpose]

lgtm