False positive - Incomplete string escaping

**Description of the false positive**

```
Incomplete string escaping or encoding
This does not escape backslash characters in the input.
```

```ts
part = `"${part.replace(/"/g, '\\"')}"`;
```

This is intentional,

actual string: `abc\"` -> `"abc\\""`

JS:
```js
'abc\\"' '"abc\\\\""'
```

This code is used in a client library to serialize caller input as-is from list to header value.

```ts
const input = ["a", "b", `\\"`];
const serialized = `a,b,"\\\\""`;
```

**Code samples or links to source code**

https://github.com/smithy-lang/smithy-typescript/blob/d8446cfa3bf6cbcf1187d1ad744ac5a296e442d7/packages/smithy-client/src/quote-header.ts#L8

Start with the linked packages/smithy-client/src/quote-header.ts example and inspect the CodeQL finding that flags its string escaping. Reproduce the report with the provided inputs, then identify the relevant query coverage; done means intentional backslashes in this serialization are no longer reported as incomplete escaping.

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