chore: remove drone and e2e

[merll]

📌 Summary

This PR removes Drone from the core apps of the platform. It has been deprecated for a while. e2e test references have also been removed, as this had been unmaintained and depending on Drone.

🔍 Reviewer Notes

For testing with the corresponding branches of Console and API, use the following values:

apps:
  otomi-api:
    _rawValues:
      image:
        tag: APL-1258
        pullPolicy: Always
  otomi-console:
    _rawValues:
      image:
        tag: APL-1258
        pullPolicy: Always

🧹 Checklist

• Code is readable, maintainable, and robust.
• Unit tests added/updated

[j-zimnowoda]

I have analyzed bin/compare.sh output and it looks good.

[Ani1357]

I found also a drone reference in src/common/utils.ts and in docs/setup.md which I think can be removed (although the later needs to be rewritten anyways). Otherwise all looks good.