Reland "[CrOS Network] Add animation to network icons"

This is a reland of commit e674a3e3b87e53d026e07de27f9b37ee41630fc2

Fix: extra ; was removed from destructor.

Original change's description:
> [CrOS Network] Add animation to network icons
>
> This CL implements network_icon::AnimationObserver to add animation
> to network icons in network list.
>
> Bug: b/244491992
> Test: Ran CQ, deployed to DUT
> Change-Id: I727b61d946aeedc81803358c734c4a11bc3dd0cd
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3868465
> Reviewed-by: Chad Duffin <chadduffin@chromium.org>
> Commit-Queue: Theo Johnson-kanu <tjohnsonkanu@google.com>
> Cr-Commit-Position: refs/heads/main@{#1044174}

Bug: b/244491992
Change-Id: I55af1baa8e428b31b0b5b431f711214888cb7587
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3883279
Reviewed-by: Chad Duffin <chadduffin@chromium.org>
Commit-Queue: Theo Johnson-kanu <tjohnsonkanu@google.com>
Cr-Commit-Position: refs/heads/main@{#1045316}