[E2E] PROMOTE TO BLOCKING: prevent_forking_outside_group_spec.rb

What does this MR do?

Promotes the following e2e tests to the blocking bucket:

1. Data Stores prevent forking outside group when enabled does not allow forking outside of group | Testcase | Spec metrics

2. Data Stores prevent forking outside group when disabled allows forking outside of group | Testcase | Spec metrics

This MR was created based on data from reliable e2e test report: #479689 (closed)

(This MR was automatically generated by gitlab_quality-test_tooling at 2024-08-19 02:05:46 UTC)