Reland "[Ads API UX Enhancements] Site Suggested Ads - Desktop"

This is a reland of commit 4d6b802f4fb5f22ccbea3b4bef5d13fdecdf2530

Original change's description:
> [Ads API UX Enhancements] Site Suggested Ads - Desktop
>
> Connecting strings to page.
>
> Screenshots:
> (1/2): https://screenshot.googleplex.com/3LqJKNAv7WMtdxQ
> (2/2): https://screenshot.googleplex.com/35VxUPvto8n3QkQ
>
> Bug: 374153527
> Change-Id: I8169651cc205f5cfd86896d5ae6fe9323b6d98a1
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6001158
> Reviewed-by: Abe Boujane <boujane@google.com>
> Commit-Queue: Jacob Stanley <jacobstanley@google.com>
> Cr-Commit-Position: refs/heads/main@{#1385896}

Bug: 374153527
Change-Id: I39c58ca11ee79b71ab7af192ea02d162c63b305f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6038796
Auto-Submit: Jacob Stanley <jacobstanley@google.com>
Reviewed-by: Abe Boujane <boujane@google.com>
Commit-Queue: Abe Boujane <boujane@google.com>
Cr-Commit-Position: refs/heads/main@{#1386343}