Brendan Abbott 0a7dc1b1c7 [devtools] Introduce REACT_DEVTOOLS_PORT for the standalone react-devtools (#30767) ...

## Summary

This PR attempts to make running the React DevTools a little friendlier
in projects that are not completely React.

At the moment, running the DevTools with `npx react-devtools` will
default to the port to use the `PORT` env variable otherwise it'll fall
back to `8097`. `PORT` is a common env variable, so we can get into this
strange situation where the a Rails server (eg Puma) is using `PORT`,
and then the React DevTools attempts to boot using the same `PORT`.

This PR introduces a dedicated env variable, `REACT_DEVTOOLS_PORT` to
assist in this scenario.

## How did you test this change?

I'm using fish shell, so I did the following, please let me know if
there's a better way:

```sh
cd packages/react-devtools
set -x PORT 1000
set -x REACT_DEVTOOLS_PORT 2000
node bin.js
```

We can see in the UI that it's listening on `2000`. Without this PR,
it'd listen on `1000`:

![Screenshot 2024-08-21 at 10 45
42 AM](https://github.com/user-attachments/assets/a5c7590c-1b54-4ac8-9a8b-8eb66ff67cfb)

2025-02-11 18:14:43 +00:00

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