[WIP] Migrate display of banner logic from Mendel to GCA events

[Adib234]

Summary

Based on this design doc, we have decided to shift away from using Mendel as the place for storing banner data as remote config to GCA events which is more suitable for our use case.

Details

On startup we fetch events.

Related Issues

How to Validate

After the cl for adding the banner campaigns has been submitted, we will test locally.

Pre-Merge Checklist

• [ ] Updated relevant documentation and README (if needed)
• [ ] Added/updated tests (if needed)
• [ ] Noted breaking changes (if any)
• [ ] Validated on required platforms/methods:
  • [ ] MacOS
    • [X] npm run
    • [ ] npx
    • [ ] Docker
    • [ ] Podman
    • [ ] Seatbelt
  • [ ] Windows
    • [ ] npm run
    • [ ] npx
    • [ ] Docker
  • [ ] Linux
    • [ ] npm run
    • [ ] npx
    • [ ] Docker