Add synchronous processing and HTTP status code validation to OtlpHttpTraceExporter #1005
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The OTLP HTTP Trace Exporter had an issue where it always returned .success regardless of the actual HTTP request result. This prevented callers from detecting failures even when network errors or 4xx/5xx responses occurred.
To fix this, the exporter now waits for the HTTP request to finish and returns the correct result based on the actual response. HTTP status code validation, error messages, and request header handling were also improved.
With this change, the exporter properly returns .failure for network issues or non-2xx responses, and failed spans are safely re-added for retry.