Clean `Processor::runJob()` and `runScheduledJob()`

[kyriog]

The \EthanYehuda\CronjobManager\Helper\Processor::runJob() method has 99% the same code of Processor::runScheduledJob().

The only difference between these two methods is when the schedule object is saved:
runJob() directly call the save() method of the schedule object itself (which is deprecated according to Magento 2 best practices) whereas runScheduledJob() runs the save() method from the object getResource().

I think runJob() should be deleted if possible, or at least being updated as deprecated and pointing to runScheduledJob() method.