Remove unnecessary explanations in cypress testing

[soartec-lab]

Summary

Test cases described as "first test" can be confusing because they fail. The first test was already written in the previous item, so I thought I didn't need this item and deleted it.

See: https://github.com/basarat/typescript-book/blob/32bbf51fc6327dfa27d166c152187fc58db63a43/docs/testing/cypress.md#first-test