Remove comment saying LOG_STREAM_NAME is a used env var (#91)

Author: NathanielRN

.github/workflows/soak-testing.yml

@@ -141,7 +141,6 @@ jobs:
           # AWS_SESSION_TOKEN
           # TARGET_SHA
           # LOGS_NAMESPACE
-          # LOG_STREAM_NAME
           # APP_PROCESS_COMMAND_LINE_DIMENSION_VALUE
           # APP_PROCESS_EXECUTABLE_NAME
           # HOSTMETRICS_INTERVAL_SECS