Integrate yaml-language-server in lefthook
Context
Follow-up of !131770 (merged).
In VScode, we see YAML errors that are more precise than the ones we spot with Yamllint.
Looking at my editor extensions locally, the RedHat YAML extension is the one that seems to do dynamic YAML linting (installed by the Kubernetes
VSCode extension by default).
https://github.com/redhat-developer/yaml-language-server is the project behind the YAML extension.
Goal
Experiment with https://github.com/redhat-developer/yaml-language-server, and see if there's a way to use it as part of our Lefthook configuration before commit/push.