Move sort timer out of loop

[HaoranYi]

Problem

Since slot_storage sort scan is sequential, there is no need to accumulate the scan timing with atomic u64.

Summary of Changes

Use measure_us to measure slot storage scan timing.

Fixes #

[codecov]

Codecov Report

Merging #33448 (12ab626) into master (cc4e928) will increase coverage by 0.0%.
Report is 1 commits behind head on master.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##           master   #33448   +/-   ##
=======================================
  Coverage    81.9%    81.9%           
=======================================
  Files         799      799           
  Lines      217340   217335    -5     
=======================================
+ Hits       178144   178145    +1     
+ Misses      39196    39190    -6     

[brooksprumo]

Love it, thanks!