Rename partial add/remove benchmarks

[dberenbaum]

Better naming for some benchmarks and fixes issues due to duplicate naming that cause plots like this:

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.27% ⚠️

Comparison is base (cae1b1b) 90.82% compared to head (117655f) 90.56%.
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9868      +/-   ##
==========================================
- Coverage   90.82%   90.56%   -0.27%     
==========================================
  Files         471      471              
  Lines       35920    35921       +1     
  Branches     5194     5194              
==========================================
- Hits        32626    32532      -94     
- Misses       2710     2783      +73     
- Partials      584      606      +22     

Files Changed	Coverage Δ
...testing/benchmarks/cli/stories/test_modify_data.py	0.00% <0.00%> (ø)

... and 27 files with indirect coverage changes

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[skshetry]

noop isn't the right word here for dvc add. Maybe update?