linear integration

[apet97]

Summary

• Updates the Linear integration to work with the current issue page layout
• Maps the Clockify description and task to the Linear issue id and title, for example [ENG-42] Fix login state
• Maps the Clockify project to the Linear project when one is set, otherwise falls back to the Linear team
• Maps Linear labels to Clockify tags

Demo

Testing

• Ran node --check src/integrations/linear.js
• Ran git diff --check
• Ran npm run compile.dev.chrome.nowatch
• Ran npm run compile.dev.firefox.nowatch