sp_HealthParser: Add xml deadlock report section

[erikdarlingdata]

Is your feature request related to a problem? Please describe.
It seems silly to skip this when we're getting the blocked process report

Describe the solution you'd like
I want the XML deadlock report data from the system health extended event session

Describe alternatives you've considered
Not getting it

Are you ready to build the code for the feature?
I think I might be the only one