jsii-rosetta: Duplicate Comments on CSharp and Java

## :bug: Bug Report

### Affected Languages

- [ ] `TypeScript` or `Javascript`
- [ ] `Python`
- [X] `Java`
- [X] .NET (`C#`, `F#`, ...)
- [ ] `Go`

### General Information
* **JSII Version:** 1.46.0
* **Platform:** osx

### What is the problem?

Comments in Java and CSharp are being duplicated

```ts
// plain values
new edge.RequiredAttributeResource(this, "plain", {
bool: res.bool,
str: res.str,
num: res.num,
});
```

gets translated to this in Java

```java
// plain values
// plain values
RequiredAttributeResource.Builder.create(this, "plain")
.bool(res.getBool())
.str(res.getStr())
.num(res.getNum())
.build();
```

and this in C#

```csharp
// plain values
// plain values
new RequiredAttributeResource(this, "plain", new Struct {
Bool = res.Bool,
Str = res.Str,
Num = res.Num
});
```

### Verbose Log

No repository files or tests are named. Start by reproducing the shown TypeScript translation and compare the Java and C# output, then trace where the comment is emitted for each target; done means each generated comment appears only once.

Written by the indexing model from the issue text.