Shorten page names on Plan EE end-to-end tests

What does this MR do?

This is another iteration to address the following issue: https://gitlab.com/gitlab-org/quality/team-tasks/issues/168

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• Separation of EE specific content