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This introduces a 'disabling' state to the cros_network_config.mojo API
and uses it in the system menu and settigns UI.

It also removes the 'Enabling' state from network_health.mojom
(instead of adding 'Disabling') since we don't care about either from
a network health perspective; the intermediate states are pseudo states
for the UI only.

Bug: 1032030
Change-Id: I1301cd87068ee8d98bf63b004dc3e9857c3bcdca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225370Reviewed-by: Azeem Arshad <azeemarshad@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774627}