Revert "[lens-rearch][4/n] Add state machine to side panel coordinator"

This reverts commit b9b997334394a18d300cf11208e7e603749a60d2.

Reason for revert: Potentially causing build failures at https://ci.chromium.org/ui/p/chromium/builders/ci/Win10%20Tests%20x64/99736/blamelist

Bug: 404941800
Original change's description:
> [lens-rearch][4/n] Add state machine to side panel coordinator
>
> Adds a state machine to the side panel coordinator. The coordinator can
> function without it, but adding it helps
> 1) Set the preceident that each component should have a state machine
>    and:
> 2) Sets up the side panel coordinator for follow up CLs where the state
>    machine will be needed
>
> Bug: 404941800
> Change-Id: Idfccb62e9e8f870309e6a5b0aaeaabc8096c7834
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6460772
> Commit-Queue: Duncan Mercer <mercerd@google.com>
> Reviewed-by: Juan Mojica <juanmojica@google.com>
> Cr-Commit-Position: refs/heads/main@{#1448975}

Bug: 404941800
Change-Id: Ie1684e416874e9ce79b859724ed618600579479a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6471872
Owners-Override: Rakina Zata Amni <rakina@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Rakina Zata Amni <rakina@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1449310}