Add printing for LATENCY related tests (#12514)
This test failed several times:
```
*** [err]: LATENCY GRAPH can output the event graph in tests/unit/latency-monitor.tcl
Expected '478' to be more than or equal to '500' (context: type eval
line 8 cmd {assert_morethan_equal $high 500} proc ::test)
```
Not sure why, adding some verbose printing that'll print the command
result on the next time.
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