Renames verify_accounts_lt_hash_us metric

[brooksprumo]

Problem

The verify_accounts_lt_hash_us metric name was to disambiguate it from the merkle-based accounts hash verification. Now that merkle-based accounts hashing is gone, we don't need that disambiguation anymore.

To be more clear, this metric is calculating the accounts lt hash. The verification happens after the calculation. So the name of the metric is slightly incorrect and could be made clearer.

Summary of Changes

Rename it.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.2%. Comparing base (dbb0c6d) to head (b054fad).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7339   +/-   ##
=======================================
  Coverage    83.2%    83.2%           
=======================================
  Files         797      797           
  Lines      361115   361115           
=======================================
+ Hits       300698   300699    +1     
+ Misses      60417    60416    -1     

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