fix(fortuna): only log unrecoverable errors in latency checker

[devin-ai-integration]

This PR modifies the latency checker to only log errors for unrecoverable failures and not for errors that are retried.

Changes:

• Added unrecoverable_errors_count metric to track truly permanent failures
• Added is_unrecoverable_error method to classify errors based on their recoverability
• Updated request method to log errors at different levels based on recoverability
• Errors that will be retried are now logged at debug level instead of error level

Link to Devin run: https://app.devin.ai/sessions/38260b3b59f44f1b94076fd70320bcac

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[devin-ai-integration]

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