editor: add a mojom call from views to ash to reject consent

This CL adds a mojom call into editor_panel.mojom to allow views to send
the user consent rejection event to ash.

Bug: b:335345311
Change-Id: I74d5df1898e6d3fc23734874c4b25db9d5ef2f19
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5599662


Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Commit-Queue: Chuong Ho <hdchuong@chromium.org>
Reviewed-by: Curtis McMullan <curtismcmullan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1313169}