Add a lock for CheckDaysSchedule and CreateDaysSchedule jobs to avoid a database deadlock when they run at the same time

Current Situation

• It is possible that a database deadlock occurs when the jobs CheckDaysSchedule and CreateDaysSchedule are running at the same time.

Desired Behavior

• A lock is added for both jobs that prevents concurrency.

Release Coverage

• This issue will not be fixed for earlier releases as we do not want to modify existing jobs that might have been customized by users.
• If desired add your own locks to existing jobs.