Replace CircleCI configuration with GitHub workflow

[brianpeiris]

• Adds a test-and-deploy-storybook workflow that runs npm test (which mostly does linting) on the client and the admin panel.
• The workflow also builds and deploys the component storybook to gh-pages, but only for pushes to the master branch (https://mozilla.github.io/hubs)
• Changed some eslint rules to warnings in the admin panel config, similar to the changes we made in Upgrade to Node LTS (16) and Webpack 5 #5619
• Removed the npm run build step from npm test, since that is already covered by the existing build workflow
• Fixed the ava configuration to conform to the updated version we now use.

[bryanenders]

[bryanenders]

Removed the npm run build step from npm test, since that is already covered by the existing build workflow

Good catch! 👏

[brianpeiris]

Had to add one extra commit to this, since the changes in #5651 broke Storybook. 7955a44