Reference to self within decorated class refers to undecorated class

TL;DR: Should a decorated class referencing itself in a method refer to the decorated class or undecorated? Currently it does the latter - which feels broken, but admittedly that may just be due to quirky code patterns.

Example code:

```ts
const bar = ...

@bar
class Foo {
baz() {
console.log(Foo);
}
}
```

To be honest, despite having done my best to read the [proposal](https://github.com/tc39/proposal-decorators?tab=readme-ov-file) and [spec](https://arai-a.github.io/ecma262-compare/?pr=2417), I cannot be certain whether esbuild is behaving incorrectly in this matter. However, I could not be certain that esbuild is deliberate in its current behavior since I could not spot a relevant case in the tests (https://github.com/evanw/decorator-tests/blob/main/decorator-tests.ts). The only case(s) that seemed similar also seemed distinct enough to not quite be relevant (i.e. the complexities involved with things like `accessor` might mean it's irrelevant to my simpler situation).

[esbuild.github.io/try link](https://esbuild.github.io/try/#YgAwLjI0LjAALS1idW5kbGUgLS10YXJnZXQ9ZXMyMDIyAGUAZW50cnkuanMAY29uc3QgYmFyID0geCA9PiBjbGFzcyBCYXIgewogIGJheigpIHsKICAgIG5ldyB4KCkuYmF6KCkKICB9Cn0KCkBiYXIKY2xhc3MgRm9vIHsKICBiYXooKSB7CiAgICBjb25zb2xlLmxvZyhGb28pOwogIH0KfQoKY29uc29sZS5sb2coRm9vKQpuZXcgRm9vKCkuYmF6KCk7Cg)

Running the built code via node (20.12.1 in case it matters) results in

```bash
[class Bar] { [Symbol(Symbol.metadata)]: [Object: null prototype] {} }
[class Foo]
```

Notably, if I modify the built code and change one line near the bottom to `var _Foo = class _FooInner {` (so as to not reuse the `_Foo` identifier for the class expression itself), then I get the result I had expected:

```bash
[class Bar] { [Symbol(Symbol.metadata)]: [Object: null prototype] {} }
[class Bar] { [Symbol(Symbol.metadata)]: [Object: null prototype] {} }
```

Reproduce the behavior using the provided esbuild.github.io/try link and compare it with the decorator-tests.ts cases and linked decorators proposal/spec. Determine whether self-references in decorated classes should resolve to the decorated class, then add a focused regression test and confirm the generated code and runtime result match the chosen semantics.

Written by the indexing model from the issue text.