feat: Implement cross-domain cookie sharing

[petesfrench]

Done

• Implements cookie service flask extension for integration with cookies.canonical.com
• Bumps cookie-policy npm package to 3.8.1
• Implement basic flask-caching to store health status of cookies.canonical.com

QA

• Check out this feature branch
• Run the site using the command ./run serve
• View the site locally in your web browser at: http://0.0.0.0:8002/
• Run through the following QA steps
• [List additional steps to QA the new features or prove the bug has been resolved]

Issue / Card

Fixes #

Screenshots

[if relevant, include a screenshot]

[webteam-app]

Demo

Jenkins

demos.haus