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This patch adds unit tests and a integration / UI test for the recently
added auto expand/collapse sheet behavior for prompt actions.

Note that there are two sides to this, Prompt has a
disable_force_expand_sheet option now to prevent prompt from auto
expanding when entering that state. The other part is
ConfigureBottomSheet, which now has a oneof (expand, collapse) to
automatically update the bottom sheet to the expected state.

Bug: b/145204744
Change-Id: I857a2be13e090d9e5d663419ead60497102cb897
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2007721
Commit-Queue: Mathias Carlen <mcarlen@chromium.org>
Reviewed-by: Sandro Maggi <sandromaggi@google.com>
Cr-Commit-Position: refs/heads/master@{#734625}