Reland "Add initial hook for Data Controls paste"

This is a reland of commit 529b2fd7622679842537c63031cf135e503a7fdb

The issue is reproducible locally, and is fixed by having the
dialog closure in browser tests performed asynchronously (see
the patchset#2 delta).

Original change's description:
> Add initial hook for Data Controls paste
>
> This CL adds the Data Controls "block" dialog after CrOS DLP rules and
> before content analysis checks.
>
> Bug: b/313090937
> Change-Id: I6f0fb7b8a1285ce1fd400d4c15821f2567196ca5
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5190269
> Commit-Queue: Dominique Fauteux-Chapleau <domfc@chromium.org>
> Reviewed-by: Nancy Xiao <nancylanxiao@google.com>
> Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
> Cr-Commit-Position: refs/heads/main@{#1247229}

Bug: b/313090937
Change-Id: I4d3cdd4aec526f9914c9fa1660e94b1c6fc4b9fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5199169
Auto-Submit: Dominique Fauteux-Chapleau <domfc@chromium.org>
Commit-Queue: Dominique Fauteux-Chapleau <domfc@chromium.org>
Reviewed-by: Nancy Xiao <nancylanxiao@google.com>
Commit-Queue: Nancy Xiao <nancylanxiao@google.com>
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1247498}