[Extensions] Display re-enable dialog for MV2 disabled stage

Chrome has announced that MV2 extensions will gradually no longer be
supported in the browser. None of these changes will take effect on any
Chrome channel before June, 2024. See more information at
https://developer.chrome.com/blog/resuming-the-transition-to-mv3.

The first stage of this is a user-visible notice in chrome://extensions,
which can be acknowledged. The second stage will disable unsupported MV2
extensions and will also have a user-visible notice.

This CL connects the re-enable dialog to be shown when the user
re-enables an extension disabled due to the MV2 deprecation.

Screencast: https://drive.google.com/file/d/1khb9y0pvxfRBWfX9XfpXZCzSKMMPGwNN/view?usp=sharing

Bug: 339061151
Change-Id: I0c9641c8407ffbaef8995b88f09b4d61878605c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5714949
Commit-Queue: Emilia Paz <emiliapaz@chromium.org>
Reviewed-by: Devlin Cronin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1328570}