Load tests property is not implemented

### Problem
In `core/src/test/resources/load_config_test.properties` a property is defined but has never been used.
```
24 # If you have set the loop count to a higher digit which e.g. should take 3hrs(3*60*60=10800sec),
25 # but due to load or network delay it could take more time(you are speculating) e.g. 4hrs, then you can
26 # set this abort value to 3hrs i.e. 3*60*60=10800sec.
27 abort.after.time.lapsed.in.seconds=600
```
### Goal
Implement use of this property in `org.jsmart.zerocode.parallel.ExecutorServiceRunner` and cover it with tests.