DesignableBanner:DesignableBanner with header image and header copy

Build 11932 on cc/banner-refactor
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Baselines
Build 11696 on main
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LatestBuild 11932 on cc/banner-refactor
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The baseline is taller than the new snapshot (1300x586 to 1300x581).
Baseline History
Build 119325d2ba4c
Current build. There are unaccepted changes, so build 11696 is still the baseline.
Build 11696936a187 current baseline
Auto-accepted
Build 9233f7f6889
Accepted by Tom Forbes.
Build 920685de6a6
Accepted by Tom Forbes.
Build 9091a51ebbd
Accepted by Tom Forbes.
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