Simplify commit iterator logic

[itaiad200]

No description provided.

[codecov-io]

Codecov Report

Merging #1017 (9e7d70a) into master (153bf85) will increase coverage by 0.00%.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master    #1017   +/-   ##
=======================================
  Coverage   46.23%   46.24%           
=======================================
  Files         152      152           
  Lines       12305    12303    -2     
=======================================
  Hits         5689     5689           
+ Misses       5893     5892    -1     
+ Partials      723      722    -1     

Impacted Files	Coverage Δ
graveler/pgiterator.go	86.95% <0.00%> (-0.19%)	⬇️
catalog/mvcc/cataloger_create_repository.go	62.96% <0.00%> (ø)
catalog/mvcc/cataloger_create_entry.go	100.00% <0.00%> (+5.26%)	⬆️

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