Update group, projects paths to analytics

What does this MR do and why?

Related https://gitlab.com/gitlab-org/product-intelligence/-/issues/591

Update projects and groups paths to use analytics section after Product Intelligence group is moved from growth to analytics

• New group path: https://gitlab.com/gitlab-org/analytics-section/product-intelligence
• New handbook page path: https://about.gitlab.com/handbook/engineering/development/analytics/product-intelligence/

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