Revert "ash: Remove //chrome/browser/ash:test_support"

This reverts commit 4ec02a9ca22886b47c0f4eb547cdd67e40cc79d8.

Reason for revert:
https://ci.chromium.org/ui/p/chromium/builders/ci/chromeos-arm64-generic-rel/47236/overview

Original change's description:
> ash: Remove //chrome/browser/ash:test_support
>
> Now that //chrome/browser/ash:test_support has no sources
> anymore, we can remove it and replace any dependencies on it
> with more specific ones.
>
> A few changes that may look unexpected are due to cyclic
> dependencies.
>
> Bug: b:359392979
> AX-Relnotes: n/a.
> Change-Id: I994a7a09c751646fc36f0553af399a2db874d5eb
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5782531
> Commit-Queue: Georg Neis <neis@chromium.org>
> Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1341416}

Bug: b:359392979
Change-Id: Ib4141b8fc67d2cbfe4be162c9b75d01338616138
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5785457
Auto-Submit: Georg Neis <neis@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Owners-Override: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1341421}