[dagit] Tag truncation on Playground
Repair long tags on the Playground view by setting a max-width. Overflow should render an ellipsis.
I also did some tidying around how the tags are rendered, including using blueprint colors and fixing some flex issues.
View Playground, add some tags including very long tags. Verify correct rendering. Shrink window horizontally, verify proper wrapping behavior.
View Runs page, verify same.
Reviewers: bengotow, catherinewu, prha, sashank
Reviewed By: prha
Differential Revision: https://dagster.phacility.com/D4864