fix(security): prevent integer overflow in uint64 to int64 conversions

Add overflow checks before converting uint64 memory values to int64
to prevent potential integer overflow issues identified by gosec (G115).

- Add math.MaxInt64 checks in fileproc/backpressure.go
- Add math.MaxInt64 checks in fileproc/resource_monitor_validation.go
- Add math.MaxInt64 checks in fileproc/resource_monitor_metrics.go
- Add math.MaxInt64 check in benchmark/benchmark.go with nosec annotation

Co-authored-by: ivuorinen <11024+ivuorinen@users.noreply.github.com>

utils/writers.go

@@ -119,13 +119,13 @@ func StreamLines(reader io.Reader, writer io.Writer, filePath string, lineProces
 		if lineProcessor != nil {
 			processedLine = lineProcessor(line)
 		}
-		
+
 		// Write line with proper line ending (except for last empty line)
 		lineToWrite := processedLine
 		if i < len(lines)-1 || line != "" {
 			lineToWrite += "\n"
 		}
-		
+
 		if _, writeErr := writer.Write([]byte(lineToWrite)); writeErr != nil {
 			wrappedErr := WrapError(writeErr, ErrorTypeIO, CodeIOWrite, "failed to write processed line")
 			if filePath != "" {
@@ -135,4 +135,4 @@ func StreamLines(reader io.Reader, writer io.Writer, filePath string, lineProces
 		}
 	}
 	return nil
-}
+}