[E2E] PROMOTE TO BLOCKING: pull_mirroring_over_http_spec.rb

What does this MR do?

Promotes the following e2e tests to the blocking bucket:

1. Create Pull mirror a repository over HTTP configures and syncs a (pull) mirrored repository with password auth | Testcase | Spec metrics

This MR was created based on data from reliable e2e test report: #458792 (closed)

(This MR was automatically generated by gitlab_quality-test_tooling at 2024-04-29 17:52:51 UTC)