* Drone: Remove verify_storybook pipeline
Already exists in GitHub Actions.
* Drone: Remove lint_backend pipeline
Already exists in GHA.
* Drone: Remove backend tests
These already exist in GitHub Actions.
* Drone: Remove shellcheck pipeline
* Drone: Remove unused images
* Drone: Remove lint_frontend pipeline
Already in GHA.
* Drone: Remove test_frontend pipeline
Already exists in GHA.
* Drone: Remove integration_benchmarks pipeline
This was last used in January. GHA does not have it, but it is relatively trivial to run locally.