sp_BlitzLock: Add a check for the rollup section for deadlocks with background processes

[erikdarlingdata]

Is your feature request related to a problem? Please describe.
I recently ran into a situation where blocking and deadlocking was happening with background processes. It was helpful for me to add a check to HumanEventsBlockViewer to summarize how often it was happening, so I'd like to get it in here too.

Describe the solution you'd like
Add a check alongside the one for deadlocks with sleeping queries to look for deadlocks with background tasks.

Describe alternatives you've considered
Living in utter darkness for 40 years

Are you ready to build the code for the feature?
Yeah, I'll have it ready shortly.

[BrentOzar]

Thanks for the pull request! Makes sense, other than the weird spaces and line return stuff. Merging into the dev branch, will be in the next release with credit to you in the release notes.