[E2E] PROMOTE TO BLOCKING: branch_with_unusual_name_spec.rb

What does this MR do?

Promotes the following e2e tests to the blocking bucket:

1. Create Branch with unusual name when branch name contains slash, hash, double dash, and capital letter renders repository file tree correctly | Testcase | Spec metrics

This MR was created based on data from reliable e2e test report: #452622 (closed)

(This MR was automatically generated by gitlab_quality-test_tooling at 2024-04-01 02:04:59 UTC)