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When an Assistant query has been submitted, you should not be able to
interact with the suggestion chips anymore.
Mouse clicks had always been disabled, but a bug still allowed the
user to submit queries using |TAB| and |ENTER|.

This CL also introduces some extra unittests that were missing.

Bug: b/151800188
Change-Id: I15fe1b946ae92c1f74b7a98656793e4d00b2a12c
Tests: ash_unittests "AssistantPageViewTest.*" and view_unittests
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2119388Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: Jeroen Dhollander <jeroendh@google.com>
Cr-Commit-Position: refs/heads/master@{#754711}