Feature/automate calling tidy jobs in background #16

[oliver-tarrant-tessella]

Add an automated background task that calls tidy_jobs at regular intervals.

This is currently configured to run once an hour.

The result of the call to tidy_jobs is recorded in the logs

Stories covered

16

To Test

• Change the sleep time to a couple of seconds
• Start the web app
• Start a few spark applications
• Check that once finished the next automated call tidies them up

[ray-millward-tessella]

I'm happy with the changes, if you could add demo files as well and then merge that would be great