Fix for counting rate limited errors as response has changed

[kshitijcode]

Summary

Fix for counting rate limited errors as response has changed and the current code doesnt increase the count.

This check is never true even if rate limited :

if "Rate limit" in response["error"].get("message", ""):

Motivation

Why are these changes necessary? How do they improve the cookbook?

Gives the correct count for num_rate_limit_errors.

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[sarbazvatanatan]