Delayed Job with priority greater than

Allows a user to create DelayedJobBackedUp and specify if they want to find jobs with a priority greater than the given priority.

Deploy Plan
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> Does Infrastructure need to know anything special about this deploy?

Rollback Plan
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* To roll back this change, revert the merge with: `git revert -m 1 MERGE_SHA` and perform another deploy.

URLs
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> Links to bug tickets or user stories.

QA Plan
-------
> Fill in scenarios below. Review [QA Best Practices](https://source.sportngin.com/page/show/1227795-qa-best-practices).

Make sure the tests look okay and pass.
The ternary operator here is excessive and you can just use an `||` here:

```ruby
self.greater_than_priority = options[:greater_than_priority] || false
```

Arguably, you could just cast it to a boolean as well:

```ruby
self.greater_than_priority = !!options[:greater_than_priority]
```