Fix syntax contexts in server action transform (#91210)
```
let x: Ident = IdentName::new(name, span).into();
```
should never be done. It uses `SyntaxContext::default()` for the Ident. So from swc's perspective, you are referring to a different variable than you think. When constructing an `Ident`, you should usually always provide a SyntaxContext.
I think this would pose a problem in Webpack because it serializes it into a code string again, but for Turbopack these SyntaxContext are important.
