forgot TEMPORAL_TEST_OTEL_OUTPUT

Author: stephanos

docs/development/testing.md

@@ -12,6 +12,7 @@ This document describes the project's testing setup, utilities and best practice
 - `CGO_ENABLED`: Set to `0` to disable CGO, which can significantly speed up compilation time.
 - `TEMPORAL_TEST_LOG_FORMAT`: Controls the output format for test logs. Available options: `json` or `console`
 - `TEMPORAL_TEST_LOG_LEVEL`:  Sets the verbosity level for test logging. Available levels: `debug`, `info`, `warn`, `error`, `fatal`
+- `TEMPORAL_TEST_OTEL_OUTPUT`: Enables OpenTelemetry (OTEL) output for failed tests to the provided file path.
 
 ## Test helpers