correctly log stats at remove_unrooted_slots

[jeffwashington]

Problem

During high account count testing, we discovered remove_unrooted_slots taking a very long time (hours).
Unfortunately, the log metrics had a bug in when to log the metrics. The metric logging code is shared. In this case, the metrics are created new each call. This means the first time to check if sufficient duration has passed will ALWAYS skip the first call and say 'no'. This prevents startup noise and gives periodic, useful metrics over time. However, in this case since we never call it a second time on the same temporary metrics struct, the metrics NEVER get logged. This is related to the skip first parameter within the elapsed time checker.

Summary of Changes

Change duration to None so that we always log the metrics NOW, the one and only time it is called from abs loop.

Fixes #

[codecov]

Codecov Report

Merging #32467 (6a10fdd) into master (a3ada9c) will increase coverage by 0.0%.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##           master   #32467   +/-   ##
=======================================
  Coverage    82.1%    82.1%           
=======================================
  Files         778      778           
  Lines      210200   210200           
=======================================
+ Hits       172640   172661   +21     
+ Misses      37560    37539   -21