CalendarHeatmap:Basic date and value

Build 854 on 2131-clean-up-stories-to-fully-enable-chromatic
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Baseline History
Build 854bab0b35
Current build. There are unaccepted changes, so build 852 is still the baseline.
Build 852bab0b35 current baseline
Accepted by Zach Stence.
Build 8426623eea
Accepted by Zach Stence.
Build 834ef3327c
Accepted by Zach Stence.
Commenting is disabled because there's a newer build on this branch