[FilesTrash] Exclude trashed files from LocalFileSuggestionProvider

The LocalFileSuggestionProvider backs both the zero state and tote
file suggestions. Files should *not* show there if they are from
trash. Exclude them at the LocalFileSuggestionProvider level to
ensure it propagates to both consumers.

Bug: b:251056153
Test: unit_tests --gtest_filter=*WhenTrash*
Change-Id: I348762507708bc4ebe28e1c3f41a37779122264c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3933604
Reviewed-by: Andrew Xu <andrewxu@chromium.org>
Commit-Queue: Ben Reich <benreich@chromium.org>
Reviewed-by: Rachel Wong <wrong@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1057251}