Fix OTLP gRPC log exporter request wrapper and timeout precedence

This commit fixes a critical bug in the OTLP gRPC log exporter where `_translate_data` was returning raw `ResourceLogs` instead of wrapping them in `ExportLogsServiceRequest`. This caused gRPC export calls to fail with a type error.

Additionally, this fixes the `timeout` argument initialization. Previously, passing `timeout=0` would be treated as None due to boolean evaluation; it now checks `if timeout is not None` to correctly respect explicit zero timeouts.

Author: pareshjoshij

exporter/opentelemetry-exporter-otlp-proto-grpc/src/opentelemetry/exporter/otlp/proto/grpc/_log_exporter/__init__.py

@@ -100,7 +100,7 @@ def __init__(
             insecure=insecure,
             credentials=credentials,
             headers=headers or environ.get(OTEL_EXPORTER_OTLP_LOGS_HEADERS),
-            timeout=timeout or environ_timeout,
+            timeout=timeout if timeout is not None else environ_timeout,
             compression=compression,
             stub=LogsServiceStub,
             result=LogRecordExportResult,
@@ -110,7 +110,7 @@ def __init__(
     def _translate_data(
         self, data: Sequence[ReadableLogRecord]
     ) -> ExportLogsServiceRequest:
-        return encode_logs(data)
+        return ExportLogsServiceRequest(resource_logs=encode_logs(data))
 
     def export(  # type: ignore [reportIncompatibleMethodOverride]
         self,