grafana dashboard + other misc things (see commit message)

[westrachel]

Note: arbitrarily lowered vus per pod constant to 5K bc of pods erroring out at prior 20K

grafana dashboard visuals:

[gcpinckert]

Great work!

Only a super minor issue; a couple of times when I ran a new test and filtered with the test name, the old data from the previous test stayed up. All in all I think that can be fixed down the line, since everything else works well.