DTS files do not respect esBuildOptions

This is a followup on:

https://github.com/egoist/tsup/discussions/793

I have figured out how to generate the `mjs` files correctly, but tsup is not using the esbuild config to decide where to output the .d.ts files, so my consumers can't actually use my packages from typescript...

That config in the discussion:

```ts
import { defineConfig } from 'tsup'

export default defineConfig([
{
entry: [
"src/*.ts",
],
dts: true,
format: 'esm',
splitting: false,
sourcemap: true,
clean: true,
esbuildOptions(opts, ctx) {
opts.entryNames = "[dir]/[name]/index"
}
},
{
entry: [
"src/*/+(index|worker|*.worker).ts",
],
dts: true,
format: 'esm',
splitting: false,
sourcemap: true,
clean: true,
}
])
```

Results in `src/foobar.ts` being built to `dist/foobar/index.mjs`, but the .d.ts file still gets built in `dist/foobar.d.ts` which is *totally* useless.