Split getSelfAndTotal.

[mstange]

When we add the function list, we'll want to be able to sort the table by either the self column or the total column.
For that use case it makes sense to have separate methods to query these values.

Functionally neutral change.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.35%. Comparing base (53a3071) to head (9f08129).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6113   +/-   ##
=======================================
  Coverage   83.35%   83.35%           
=======================================
  Files         339      339           
  Lines       35941    35947    +6     
  Branches    10058    10059    +1     
=======================================
+ Hits        29957    29963    +6     
  Misses       5556     5556           
  Partials      428      428           

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