[E2E] PROMOTE TO BLOCKING: create_group_wiki_page_spec.rb

What does this MR do?

Promotes the following e2e tests to the blocking bucket:

1. Plan Creating pages in group wikis when wiki is empty creates a new page | Testcase | Spec metrics

2. Plan Creating pages in group wikis when wiki has a home page adds a second page | Testcase | Spec metrics

This MR was created based on data from reliable e2e test report: #474783 (closed)

(This MR was automatically generated by gitlab_quality-test_tooling at 2024-07-29 02:06:41 UTC)