[Gardener] Revert "vc-dlc-ui: Connect the UI to the backend"

This reverts commit 9c4ebbc9503d3119e6b071d617b43c62d6ad39a5.

Reason for revert: the added VcTileUiControllerTests fail on Linux
ChromiumOS MSan, e.g. see
https://ci.chromium.org/ui/p/chromium/builders/ci/Linux%20ChromiumOS%20MSan%20Tests/42945/test-results?sortby=&groupby=

Original change's description:
> vc-dlc-ui: Connect the UI to the backend
>
> Update the download UI of VC toggle effects tiles according to the state
> of the DLCs associated with the tiles. This CL makes the connection for
> just the "Live caption" tile; connections for other tiles will be made
> in a future CL.
>
> Bug: b:312771691
> Change-Id: If1bd06ac4b1eb7fbc33365047c211801b0853e26
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5502653
> Reviewed-by: Andre Le <leandre@chromium.org>
> Reviewed-by: Michael Cui <mlcui@google.com>
> Reviewed-by: Akihiro Ota <akihiroota@chromium.org>
> Commit-Queue: Alex Newcomer <newcomer@chromium.org>
> Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
> Reviewed-by: Joel Hockey <joelhockey@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1295833}

Bug: b:312771691
Change-Id: I8ccd760c3e8c8d0ccedf25ee175996e4e937c410
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5514342
Commit-Queue: Michelle Chen <michellegc@google.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Owners-Override: Michelle Chen <michellegc@google.com>
Cr-Commit-Position: refs/heads/main@{#1295920}