Allow signature help argument count to be equal to argument index

[Andarist]

fixes the issue reported here https://github.com/microsoft/TypeScript/issues/58191#issuecomment-2054196481 a regression from https://github.com/microsoft/TypeScript/pull/56372 , not fixed by https://github.com/microsoft/TypeScript/pull/57637

[typescript-bot]

This PR doesn't have any linked issues. Please open an issue that references this PR. From there we can discuss and prioritise.

[jakebailey]

@typescript-bot pack this

[typescript-bot]

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
pack this	✅ Started	✅ Results

[typescript-bot]

Hey @jakebailey, I've packed this into an installable tgz. You can install it for testing by referencing it in your package.json like so:

{
    "devDependencies": {
        "typescript": "https://typescript.visualstudio.com/cf7ac146-d525-443c-b23c-0d58337efebc/_apis/build/builds/161380/artifacts?artifactName=tgz&fileId=BCF59F43A5EC9B506AB89789B11D216B6577E1C070792765F4BBC471CF9C056502&fileName=/typescript-5.5.0-insiders.20240419.tgz"
    }
}

and then running npm install.

---

There is also a playground for this build and an npm module you can use via "typescript": "npm:@typescript-deploys/[email protected]".;