Use semantic headers in SingleStatComponent in admin elasticsearch form

Chad Lavimoniererequested to merge
518121-admin-elasticsearch-stats into master

What does this MR do and why?

Use semantic headers in SingleStatComponent in admin elasticsearch form

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Screenshots or screen recordings

Before After
Screenshot_2025-02-21_at_17.54.24 Screenshot_2025-02-21_at_17.54.57

How to set up and validate locally

  1. Check out this branch
  2. Visit the Admin search settings page and expand the Indexing status header
  3. Use devtools to inspect the Initial indexing queue length and Incremental indexing queue length header texts
  4. They will both be rendered with H3 elements

Related to #518121

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