Fix `export const foo = function bar(){}` in server reference transform (#100830)
It was doing something like this:
```js
"use server";
export const foo = async function bar() {
return 'exported named function expression';
};
ensureServerEntryExports([
bar, // should be foo!
]);
registerServerReference(bar, "003c8ed39a99caf636869d076cc7cae786a4053164", null); // shoudl be foo!
```
leading to
```
тип ReferenceError: quux is not defined
at module evaluation (test/development/app-dir/source-mapping/app/actions1.ts:15:35)
at module evaluation (test/development/app-dir/source-mapping/app/page.tsx:2:1)
13 | }
14 |
> 15 | export const qux = async function quux() {
| ^
16 | return 'exported named function expression'
17 | }
18 | {
page: '/'
}
```