[EE] Resolve "Consider reorganizing the QA scenarios"

What does this MR do?

EE MR for https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/20931.

› tree -CA qa/qa/specs/features
qa/qa/specs/features
├── api
│   ├── 1_manage
│   │   └── users_spec.rb
│   ├── 2_plan
│   ├── 3_create
│   │   └── repository
│   │       └── files_spec.rb
│   ├── 4_verify
│   ├── 5_package
│   ├── 6_release
│   ├── 7_configure
│   └── ee_geo
│       └── geo_nodes_spec.rb
├── browser
│   └── 4_verify
│       └── runner
│           └── register_runner_spec.rb
└── browser_ui
    ├── 1_manage
    │   ├── login
    │   │   ├── log_in_spec.rb
    │   │   ├── log_into_gitlab_via_ldap_spec.rb
    │   │   └── log_into_mattermost_via_gitlab_spec.rb
    │   └── project
    │       ├── create_project_spec.rb
    │       ├── import_github_repo_spec.rb
    │       └── view_project_activity_spec.rb
    ├── 2_plan
    │   └── issue
    │       └── create_issue_spec.rb
    ├── 3_create
    │   ├── merge_request
    │   │   ├── create_merge_request_spec.rb
    │   │   ├── merge_merge_request_from_fork_spec.rb
    │   │   ├── rebase_merge_request_spec.rb
    │   │   └── squash_merge_request_spec.rb
    │   ├── repository
    │   │   ├── clone_spec.rb
    │   │   ├── create_edit_delete_file_via_web_spec.rb
    │   │   ├── push_over_http_spec.rb
    │   │   └── push_protected_branch_spec.rb
    │   └── wiki
    │       └── create_edit_clone_push_wiki_spec.rb
    ├── 4_verify
    │   ├── pipeline
    │   │   └── create_and_process_pipeline_spec.rb
    │   ├── runner
    │   │   └── register_runner_spec.rb
    │   └── secret_variable
    │       └── add_secret_variable_spec.rb
    ├── 5_package
    ├── 6_release
    │   └── deploy_key
    │       ├── add_deploy_key_spec.rb
    │       └── clone_using_deploy_key_spec.rb
    ├── 7_configure
    │   ├── auto_devops
    │   │   └── create_project_with_auto_devops_spec.rb
    │   └── mattermost
    │       └── create_group_with_mattermost_team_spec.rb
    └── ee_geo
        ├── attachment_replication_spec.rb
        ├── rename_replication_spec.rb
        └── repository_replication_spec.rb

34 directories, 30 files

Does this MR meet the acceptance criteria?

• Conforms to the code review guidelines
  • Has been reviewed by a Backend maintainer
• EE specific content should be in the top level /ee folder
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• If you have multiple commits, please combine them into a few logically organized commits by squashing them
• End-to-end tests pass (package-and-qa manual pipeline job)
• Add an entry to https://gitlab.com/gitlab-org/backstage-changelog once merged.

What are the relevant issue numbers?