[exporter/datadog] Mark unrecoverable errors as permanent

[songy23]

Description:

Add a helper function that wraps unrecoverable errors with consumererror.Permanent so that they are not retried.

Right now the Datadog metrics exporter retries on all errors, but there are certain response status code that indicates the error is unrecoverable and thus shouldn't be retried: https://github.com/DataDog/datadog-agent/blob/89b27708ab6872a0208fae3b98ccf70a8bac6b79/pkg/forwarder/transaction/transaction.go#L337-L354.

Link to tracking Issue:

Testing:

Documentation:

[songy23]

Please add Skip Changelog since this PR is not directly visible to users.

[runforesight]

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Job	Failed Steps	Tests
integration-tests	N/A	N/A	See Details

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