Refactor CLI classes so everything is environment aware

[pugnascotia]

After #49612 is merged, all CLI tools will support -E options (whether or not they do anything with them). We should look at the CLI class hierarchy and see if we can simplify it e.g. remove any unnecesary abstractions.

[elasticmachine]

Pinging @elastic/es-core-infra (:Core/Infra/Core)

[williamrandolph]

@pugnascotia Is this still something you'd like to do? Otherwise I am not sure if this refactoring is enough of a priority to keep an open issue for it.

[pugnascotia]

Eh, it's very low priority.