AreaChart:With steps, fmt and labels

Build 841 on 2131-clean-up-stories-to-fully-enable-chromatic
1200px
Reviewing disabled
Baseline History
Build 8418b85925
Current build. There are unaccepted changes, so build 834 is still the baseline.
Build 834ef3327c current baseline
Accepted by Zach Stence.
Build 486b753158
Accepted by Archie Sarre Wood.
Build 36739ac076
Accepted by Zach Stence.
Build 3653fd43b3
Accepted by Zach Stence.
Commenting is disabled because there's a newer build on this branch