Related to #4242

Bug description
Using the method deleteJobInstance from JobRepository does not work if a JobExecution still has StepExecutions

Explications from my understanding
The work done in this commit works well: when you call JobRepository.findJobExecutions() it returns the JobExecutions with all the StepExecutions

However when you call JobRepository.deleteJobInstance() the method called for retrieving the JobExecutions is not JobRepository.findJobExecutions() but this.jobExecutionDao.findJobExecutions(jobInstance) thus resulting in the abscence of the StepExecutions in the JobExecutions

Environment
Spring Batch 5.0.1

Steps to reproduce

1. Create a new Job.
2. Try to delete all Executions/Instances of this Job using deleteJobInstance
3. Foreign Key Constraint Violation error occurs

Expected behavior
All objects are correctly deleted from the database using deleteJobInstance

Thanks in advance for the consideration