FE: Work Items - visualize records using colors

Summary

This is the frontend issue for the requirements found in &10004 (closed). Note that we have a technical spike in #394862 (closed).

The feature will be delivered in following parts

• Extract color picker from labels - !140702 (merged)
• Create a work item color component with inline editing - !141639 (merged)
• Create a work item color component with edit button - !145410 (merged)
• Modify color picker with new UX - !145934 (merged)