Try to reduce testing viewport

What does this MR do?

Hoping that we don't hit into

Selenium::WebDriver::Error::NoSuchDriverError:
      invalid session id

Again.

Does this MR meet the acceptance criteria?

EE at https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/11031

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

Closes #58882 (closed)