[E2E] PROMOTE TO BLOCKING: add_new_directory_in_web_ide_spec.rb

What does this MR do?

Promotes the following e2e tests to the blocking bucket:

1. Create Add a directory in Web IDE when user adds a new empty directory shows successfully but not able to be committed | Testcase | Spec metrics

2. Create Add a directory in Web IDE when a directory with the same name already exists throws an error | Testcase | Spec metrics

This MR was created based on data from reliable e2e test report: #456047 (closed)

(This MR was automatically generated by gitlab_quality-test_tooling at 2024-04-15 02:05:35 UTC)