Use new syntax for auto promotions

[DamjanBecirovic]

The old auto_promote_on syntax is deprecated and all examples of it should be changed to use
auto_promote with when conditions.
Here are the files that need to be updated found by grep-ing the repository:

• docs/use-cases/java-spring-continuous-integration.md
• docs/use-cases/clojure-luminus-ci-cd.md
• docs/use-cases/deployment-to-aws-elastic-beanstalk.md
• docs/use-cases/google-cloud-run-continuous-deployment.md
• docs/use-cases/continuous-deployment-of-a-static-website.md
• docs/use-cases/ci-cd-for-microservices-on-kubernetes.md
• docs/use-cases/netlify-continuous-deployment.md
• docs/use-cases/zeit-now-continuous-deployment.md