fix: Add page title to duo home in SaaS admin

Lindsey Sheltonrequested to merge
559191-add-title-to-saas-admin-duo-page into master

What does this MR do and why?

This is a follow up for the following GitLab Issue: #559191 (closed) and #560178 (closed)

This adds a title to the SaaS Admin GitLab Duo page, as well as removes the redirect banner from SaaS Group level Usage Quotas.

Screenshots or screen recordings

Before After Note
SaaS Admin - GitLab Duo Screenshot_2025-08-06_at_11.37.10_AM Screenshot_2025-08-06_at_11.20.57_AM Added Page Title & Subtitle
SaaS Group - Usage Quotas Screenshot_2025-08-06_at_11.36.53_AM Screenshot_2025-08-06_at_11.21.31_AM Removed banner and tab
SM Admin - GitLab Duo Screenshot_2025-08-06_at_11.29.51_AM Screenshot_2025-08-06_at_11.23.21_AM Fixed spacing between cards

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Related to #559191 (closed)

Edited by Lindsey Shelton

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