sp_BlitzLock - Performance improvement when using system_health event session

[erikdarlingdata]

Is your feature request related to a problem? Please describe.
In the sys.fn_xe_file_target_read_file function lives a column called object_name that can be used to filter to just the rows returned for the deadlock xml. Using this is usually much faster.

Describe the solution you'd like
I would like to add one weird line of code to make this thing go a lot faster.

Describe alternatives you've considered
Being happy.

Are you ready to build the code for the feature?
It is done.

[BrentOzar]

Thanks for the pull request! Looks good, merging into the dev branch, will be credited to "Red Wine at 5AM" in the release notes.

[erikdarlingdata]

One additional note for future reference: There is also a timestamp_utc column available in SQL Server 2017+, but it is rather buggy. I am skipping going down the dynamic SQL route here for now.