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If a MakeCredential or GetAssertion request has set user verification
requirement to "discouraged", then send the request as presence-only.
ChromeOSAuthenticator will then do presence-only authentication for
this request.

Change-Id: I40f382368e8399c328e830984e433fd56f7cd6fc
Bug: b:144861739
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2124935Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#755236}