[E2E] PROMOTE TO BLOCKING: maven_group_level_spec.rb

What does this MR do?

Promotes the following e2e tests to the blocking bucket:

1. Package Maven group level endpoint via maven using a ci job token pushes and pulls a maven package | Testcase | Spec metrics

2. Package Maven group level endpoint duplication setting when enabled allows users to publish duplicates | Testcase | Spec metrics

3. Package Maven group level endpoint duplication setting when disabled prevents users from publishing duplicates | Testcase | Spec metrics

This MR was created based on data from reliable e2e test report: #462605 (closed)

(This MR was automatically generated by gitlab_quality-test_tooling at 2024-05-20 02:05:15 UTC)