projects: delete scarlet Bit-rotted, and far from compiling sadly. It'll always be in the git history if we want to resurrect it someday for some reason. BUG=b:177003034 TEST=CQ Change-Id: If0369980f33ef3baca519504f5dbd7638272cc5d Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/zephyr-chrome/+/2634347 Tested-by: Jack Rosenthal <jrosenth@chromium.org> Auto-Submit: Jack Rosenthal <jrosenth@chromium.org> Commit-Queue: Paul Fagerburg <pfagerburg@chromium.org> Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org> 
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