shortcuts: Refactor layoutInfo

 * LayoutInfos are static data that provide additional details for the
   app for styling.
 * ash_accelerator_configuration should only provide the accelerator
   data down so that accelerator_configuration_provider can get the
   accelerator data to process && generate layout Info for SWA frontend.
 * Move layoutInfo related code from ash_accelerator_configuration to
   accelerator_configuration_provider.
 * Move/Update the test related to layoutInfo.

Bug: b:216049298
Test: ash_unittest && ash_webui_unittest

Change-Id: I875cbd31e3de0ecddad4d4ad279d3b21abd82294
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3961718
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Reviewed-by: Jimmy Gong <jimmyxgong@chromium.org>
Reviewed-by: Matthew Denton <mpdenton@chromium.org>
Commit-Queue: Longbo Wei <longbowei@google.com>
Cr-Commit-Position: refs/heads/main@{#1066299}