Add retry and status code handling tests to trace exporter #1960
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Adds unit tests verifying that the OTLP HTTP trace exporter retries on 5xx and 429 responses, and does not retry on client errors (4xx). Confirms exponential backoff and export result statuses are mapped correctly according to the spec.
Adding a few tests at a time to ultimately fully harden otlp-http, otlp-grpc, and otlp-common
Refs: #1667