Chore: Upgrade Go to 1.21.5 (#79329)
* bumping grafanas go version to 1.21.5
* adding how to upgrade go doc
* removing the whole ci-build and corresponding pipelines
* clarifying that we have to run make drone
* fixing starlark linter and removing unused code
* Adding note about enterprise
* trying to change the underyling image to avoid musl issues
* only need to golang one
(cherry picked from commit 4991e71b85)
(cherry picked from commit 70629d8865)
# Conflicts:
# .drone.yml
# .github/workflows/alerting-swagger-gen.yml
# .github/workflows/codeql-analysis.yml
# .github/workflows/pr-codeql-analysis-go.yml
# .github/workflows/publish-kinds-next.yml
# .github/workflows/publish-kinds-release.yml
# .github/workflows/verify-kinds.yml
# Dockerfile
# Makefile
# scripts/build/ci-build/Dockerfile
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