[BUG] `AudioTranscription` and `AudioTranslation` are missing the explicit conversion operator from `ClientResult`

[joseharriaga]

Describe the bug

All our top-level output types (i.e., the types that are returned directly from client methods) should have this operator, which comes from the generator. Here's an example from ChatCompletion:

public static explicit operator ChatCompletion(ClientResult result);

For some reason, AudioTranscription and AudioTranslation didn't get one. 🤔

Steps to reproduce

You can see that it is missing in the API listing:
🔗 https://github.com/openai/openai-dotnet/blob/OpenAI_2.4.0/api/OpenAI.net8.0.cs#L1135
🔗 https://github.com/openai/openai-dotnet/blob/OpenAI_2.4.0/api/OpenAI.net8.0.cs#L1194

Code snippets

OS

Windows

.NET version

.NET 8

Library version

2.4.0