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Previously, an interaction was started and this triggered UI to show.
Now, the UI is shown/hidden as desired and, depending on the entry
point, this will start an interaction as necessary.

This is important because we have the need to launch Assistant UI
without an interaction. This will occur when linking into Assistant
Settings, Reminders, etc.

Unit tests to follow in b/77656544.

Bug: b:80542452
Change-Id: I6de066b3a9ed86590b1fc467b4baa36f02833c66
Reviewed-on: https://chromium-review.googlesource.com/1106597Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#569465}