Fix `npm install` error with some languages (#12087)

If you have already installed `node` using `brew install node`, you are
fine. If you did not install `node` on you local machine, it fails.

The `node_binary` path is actually not included in environment variable.
When run `npm install`, some extensions like `eslint`, may run some
commands like `sh -c node .....`. Since `node_binary` path is not
included in `PATH` variable, `sh -c node ...` will fail complaining that
"command not found". If you have installed `node` before, `node` is
already included in `PATH`, so you are fine. If not, it fails.

Closes #11890

Release Notes:

- Fixed Zed's internal Node runtime not being put in `$PATH` correctly
when running language servers and other commands with `node`.
([#11890](https://github.com/zed-industries/zed/issues/11890))

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Co-authored-by: Thorsten Ball <mrnugget@gmail.com>