Update the cypress tests for #1306 to check for error codes

[commjoen]

What kind of changes does this PR include?

• Fixes or refactors
• A new challenge
• Additional documentation
• Something else: embeds error codes in docker container spoil exercisses and checks in cypress if these are present in spoils

Description

Relations

Relates to #1306

References

Checklist:

TODOs:

• For all spoils, have standardized error responses in the spoil (config, decrypt, execute error)
• Fix the cypress tests: error codes should not be in the spoils
• Extend the docker container tests for each docker based challenge
• Create a workflow in github based on docker tests for heroku.
• Extend minikube vault test workflow with checks on each of these of the k8s/vault challenges.

GENERAL CHECKLIST:

• All the contributions made are solely the work of me and my co-authors
• I tested the changes in this PR (if applicable)
• I added unit tests to ensure my change works (when change in Java or on front-end code)
• I added UI tests to ensure my UI changes work (when change in the overall UI, not needed if just adding a challenge)
• The PR passes pre-commit hooks and automated tests