test: added an end2end test for every operator

[jjmachan]

Description

closes:

[codecov[bot]]

Codecov Report

Merging #183 (e417e52) into main (d5baee4) will decrease coverage by 0.95%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #183      +/-   ##
==========================================
- Coverage   60.10%   59.15%   -0.96%     
==========================================
  Files          24       24              
  Lines        1133     1136       +3     
==========================================
- Hits          681      672       -9     
- Misses        452      464      +12     

Flag	Coverage Δ
unit-tests	59.15% <ø> (-0.96%)	:arrow_down:

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Impacted Files	Coverage Δ
bentoctl/utils/usage_stats.py	78.26% <0.00%> (-16.74%)	:arrow_down:
bentoctl/cli/utils.py	61.76% <0.00%> (-11.77%)	:arrow_down:

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