Fix flaky spec helper for local testing

[kennyadsl]

Summary

Locally, it was not running flaky specs, because I forgot to add the normal run when we are not in the CI.

I noticed this by running specs locally and seeing that flaky were skipped.

Checklist

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[codecov]

Codecov Report

Merging #4948 (3ee9736) into master (7be1937) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #4948      +/-   ##
==========================================
- Coverage   86.69%   86.69%   -0.01%     
==========================================
  Files         578      578              
  Lines       14673    14674       +1     
==========================================
  Hits        12721    12721              
- Misses       1952     1953       +1     

Impacted Files	Coverage Δ
core/lib/spree/testing_support/flaky.rb	87.50% <0.00%> (-12.50%)	⬇️

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