Fix unexpected NumberFormatException in Durations.parse() by replacing with documented thrown ParseException.

This fixes parsing of invalid second value long to throw the correct exception. Most users should already be handling ParseExceptions e.g. for invalid nanos

PiperOrigin-RevId: 686281774

java/util/src/main/java/com/google/protobuf/util/Durations.java

@@ -237,7 +237,12 @@ public final class Durations {
       nanoValue = secondValue.substring(pointPosition + 1);
       secondValue = secondValue.substring(0, pointPosition);
     }
-    long seconds = Long.parseLong(secondValue);
+    long seconds;
+    try {
+      seconds = Long.parseLong(secondValue);
+    } catch (NumberFormatException e) {
+      throw new ParseException("Invalid duration string: " + value, 0);
+    }
     int nanos = nanoValue.isEmpty() ? 0 : Timestamps.parseNanos(nanoValue);
     if (seconds < 0) {
       throw new ParseException("Invalid duration string: " + value, 0);