refactor get operation

[reuvenharrison]

Replace Operations()[operation] by GetOperation(operation) which is cheaper.

[codecov]

Codecov Report

Attention: Patch coverage is 93.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.59%. Comparing base (c322a59) to head (2a6a585).

Files	Patch %	Lines
checker/check_api_removed.go	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #568      +/-   ##
==========================================
+ Coverage   84.80%   85.59%   +0.79%     
==========================================
  Files         227      227              
  Lines       12963    10830    -2133     
==========================================
- Hits        10993     9270    -1723     
+ Misses       1563     1153     -410     
  Partials      407      407              

Flag	Coverage Δ
unittests	85.59% <93.33%> (+0.79%)	⬆️

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