Drone: Delete migrated workflows (#106870)

* 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.

scripts/drone/utils/images.star

@@ -20,20 +20,11 @@ images = {
     "ubuntu": "ubuntu:22.04",
     "curl": "byrnedo/alpine-curl:0.1.8",
     "plugins_slack": "plugins/slack",
-    "python": "python:3.8",
-    "postgres_alpine": "postgres:12.3-alpine",
-    "mimir": "grafana/mimir-alpine:r316-55f47f8",
-    "mysql8": "mysql:8.0.32",
-    "redis_alpine": "redis:6.2.11-alpine",
-    "memcached_alpine": "memcached:1.6.9-alpine",
     "package_publish": "us.gcr.io/kubernetes-dev/package-publish:latest",
-    "openldap": "osixia/openldap:1.4.0",
     "drone_downstream": "grafana/drone-downstream",
     "docker_puppeteer": "grafana/docker-puppeteer:1.1.0",
     "docs": "grafana/docs-base:latest",
     "cypress": "cypress/included:14.3.2",
     "dockerize": "jwilder/dockerize:0.6.1",
-    "rocky": "rockylinux:9",
-    "wine": "scottyhardy/docker-wine:stable-9.0",
     "github_app_secret_writer": "us-docker.pkg.dev/grafanalabs-global/docker-deployment-tools-prod/github-app-secret-writer:2024-11-05-v11688112090.1-83920c59",
 }