tsup unnecessarily strips the `node:` prefix when building for cjs

Calling `require("node:path")` was added in Node v14.18.0, but tsup adds the `nodeProtocolPlugin` to the list of esbuild plugins whenever building for `cjs`. I'd like to be able to build for cjs while targeting Node >= 14.18 and preserve the original `node:` require path. It also seems like this is unnecessary since esbuild handles this here:

https://github.com/evanw/esbuild/issues/1760

Start by locating the nodeProtocolPlugin and the configuration that adds it for cjs builds. Compare that behavior with the linked esbuild issue and verify that a cjs build targeting Node >=14.18 preserves the original node: require path.

Written by the indexing model from the issue text.