fix(worker): handle SharedWorker string name option - #15012

Summary

Fix the string name overload of SharedWorker.

Previously, Rspack transformed:

new SharedWorker(url, "chat");

into:

new SharedWorker(url, Object.assign({}, "chat", { type: "module" }));

This converted the string into an object without a name property, causing the SharedWorker name to be lost.

This PR handles the second argument based on its syntax:

• Object literals keep the existing Object.assign behavior.
• String literals are preserved for classic output and converted to { name: "chat", type: "module" } for module output.
• Expressions whose type is unknown at compile time use a runtime check to distinguish strings from objects and are evaluated only once.

Since the SharedWorker flag and option kind jointly describe one rendering semantic, they are encoded together to keep add_dependencies within Clippy's argument limit.

The new behavior is limited to SharedWorker. Worker, Service Worker, Node.js Worker, and custom worker aliases are unchanged.

Related links

• Follow-up to fix(worker): add module type when options are omitted in module output #14874
• https://html.spec.whatwg.org/multipage/workers.html#shared-workers-and-the-sharedworker-interface

Checklist

• Tests updated (or not required).
• Documentation updated (not required).