Support inferring rate-limited endpoints in OpenAPI

[captainsafia]

Starting in .NET 7, it is possible to enable rate-limiting on certain endpoints. When this is the case, the endpoints might return a response with a 503 status code.

We don't currently pass this information to any OpenAPI annotations, but we should probably document this when it is possible to infer.

Note: this is similar to the problem with the global ProblemDetails service (pun intended) and is related to #44192.

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