Changed DataChart to improve how swatches are rendered for detail and legend #6173
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What does this PR do?
Changed DataChart to improve how swatches are rendered for detail and legend.
The key concept is that instead of always drawing a path and filling it, we now draw a line and style the stroke to align better with how the Chart renders.
Where should the reviewer start?
DataChart.js
What testing has been done on this PR?
Check Detail and Legend stories.
Enhanced Legend story to include dash and round.
Verified that unit test snapshots changes are expected.
How should this be manually tested?
Detail and Legend stories
Do Jest tests follow these best practices?
no test changes
What are the relevant issues?
#6119
Screenshots (if appropriate)
Do the grommet docs need to be updated?
no
Should this PR be mentioned in the release notes?
yes
Is this change backwards compatible or is it a breaking change?
backwards compatible