fix: warn instead of failing for json log line parse error (#1336)

## Description:
Occassionally, we hit a race condition between the `LogsAggregator`
writing a log line while `service logs` is reading and streaming log
files. This results in a half written json log line being read while
streaming logs and a parsing error to occur. Instead of failing
immediately, this PR logs a `Warn` instead and continues to read the log
file.


## Is this change user facing?
YES

engine/server/engine/centralized_logs/client_implementations/persistent_volume/stream_logs_strategy/per_week_stream_logs_strategy.go

@@ -244,7 +244,8 @@ func (strategy *PerWeekStreamLogsStrategy) sendJsonLogLine(
 	// First decode the line
 	var jsonLog JsonLog
 	if err := json.Unmarshal([]byte(jsonLogLineStr), &jsonLog); err != nil {
-		return stacktrace.Propagate(err, "An error occurred parsing the json log string: %v\n", jsonLogLineStr)
+		logrus.Warnf("An error occurred parsing the json log string: %v. Skipping sending this log line.", jsonLogLineStr)
+		return nil
 	}
 
 	// Then extract the actual log message using the "log" field