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The onEnrolling_() method and its EnrollmentStatus argument type were
conflating two logically separate events: fingerprint sample status
updates ("sensor was touched") and handling the final enrollment
response. Splitting the type in two (SampleResponse / EnrollmentResponse),
and handle them in separate methods simplifies the code.

Also improve error handling in both cases:
- failure status codes in a SampleResponse cause a "try again"
  message in the enrollment sheet to be shown
- CTAP2 errors on the EnrollmentResponse make the dialog proceed to the
  error sheet

Bug: 974046
Change-Id: Ib8492aae493374f84b368bb6eca6b9eb439af685
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1999268
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732650}