Eche: Add missing enums to metrics xml config.

Adds new enum states for different network errors, originally added in
https://chromium-review.googlesource.com/c/chromium/src/+/4074725

Change-Id: I677bac39c124d45ed9c91ff8d1cbd5c7eca7f8f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4298725


Auto-Submit: Jon Mann <jonmann@chromium.org>
Reviewed-by: Abbas Nayebi <nayebi@google.com>
Commit-Queue: Crisrael Lucero <crisrael@google.com>
Cr-Commit-Position: refs/heads/main@{#1118940}