Fix and Run storybook-test:ci as part of our design approval process + Show previews on PRs

[ntindle]

We added Storybook to our system to help design stability and progress but currently aren't working on

• Upkeeping storybook
• Ensuring its tests pass
• Getting design write-off

In order to do these things, adding Storybook to the CI would be wise.

TODO:

• Fix the storybook tests to be
  • Running
  • Functional
  • Meaningful
• Fix the components
  • Not require external classes for styling
  • Match Pixel for pixel the designs in storybook renderer
• Add the following to platform-frontend-ci.yml
  ```yml
  - name: Run Storybook
  run: |
  yarn storybook-test:ci
  ```
• Add @OliviaGrace as a required approver for anthing in the following folders
  • autogpt_platform/frontend/src/components/ui
  • autogpt_platform/frontend/src/components/agptui