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This CL improves the user interface for the selection of login options. It adds an optional sublabel and an optional |learn_more| popup that displays additional information to the user when tapped.

This CL also adds several missing a11y strings for the edit buttons of user form sections.

Example video and screenshots in the bug linked below.

Bug: b/143694298
Change-Id: Ibcbc939b03e9d078d5979672ea9ca4677abd55b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1893209
Commit-Queue: Clemens Arbesser <arbesser@google.com>
Reviewed-by: Mathias Carlen <mcarlen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713804}