Resolve "[A/B Experiment] Homepage test - Customer testimonials above the fold"

1. Change Summary

[Describe what is changing, why, and the impact]

• When the UI changes to this MR are approved, we will want to hide this from the application so that the control is set to be unchanged. After we merge this MR, we will need to use Optimizely to show the variant with the customer testimonials
• Make sure there are no regressions with https://gitlab.com/search?search=CommonQuoteCarousel&nav_source=navbar&project_id=55044057&group_id=13465353&search_code=true&repository_ref=main

2. QA Checklist

[This merge request should follow all best practices utilizing our team code standards and our project's development documentation]

• Code Cleanup: Any messages, linter warnings, and/or deprecation warnings are cleaned up in the console
• Tech Debt: I have created, or documented, any fast follow-up work that needs to be done after this MR is merged
• Common Component Regression Check: I have verified all impacted pages of my common component updates have been checked for regressions and UX is aware of any wider-scoped visual changes
• Efficient Code Review: I have tested and reviewed my own changes thoroughly before assigning a reviewer
• Accessibility: Axe tools run and issues addressed
• Cross-browser compatibility: Works on Safari, Chrome, and Firefox
• Analytics and SEO: Compatible with Google Analytics and SEO tools
• Localization checked for regressions

[Provide concise steps to test the changes]

Review App

Production	Review app	Screenshot
https://about.gitlab.com/	https://927-confidential-issue.about.gitlab-review.app/	Screenshot

Closes #927