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This CL adds a second container for generic UI to the CollectUserData
action. The first container is right after prepended_sections (no
change), the new second container is after appended_sections.

Conceptually, this will allow the specification of additional sections,
both prepended and appended ones, in either the dedicated proto or via
generic UI.

In the mid-term, I plan to remove those legacy additional sections
completely, but for now, the two will co-exist.

Bug: b/145043394
Change-Id: Iaabfa5fd7d3b71b287e9b0458fcd0790553ee490
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2030488
Commit-Queue: Clemens Arbesser <arbesser@google.com>
Reviewed-by: Mathias Carlen <mcarlen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737313}