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Adds configuration step to Crostini installer dialog steps. That step is
present only when CrostiniAnsibleInfrastructure feature flag is enabled.

Bug: 1022784
Change-Id: Ia0201eb75780be5691774a9546ae2c43c91c8b03
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1910232
Commit-Queue: Olya Kalitova <okalitova@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Nic Hollingum <hollingum@google.com>
Cr-Commit-Position: refs/heads/master@{#719108}