src: fix extra includes of "env.h" and "env-inl.h"

Due to how the Environment class is used throughout the codebase, there
are a log of includes referencing eitehr env.h or env-inl.h.

This commit cleans up the remaining extra includes of 'env.h' or
'env-inl.h' and adds forward declarations of the Environment class.

PR-URL: https://github.com/nodejs/node/pull/32293
Refs: https://github.com/nodejs/node/issues/27531

Fixes: https://github.com/nodejs/node/issues/27531


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>