test: Use DummyJSON instead of Google Analytics for integration tests

[edgarrmondragon]

• https://dummyjson.com/docs

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📚 Documentation preview 📚: https://meltano-sdk--2551.org.readthedocs.build/en/2551/

[codspeed-hq]

CodSpeed Performance Report

Merging #2551 will not alter performance

_{Comparing edgarrmondragon/test/dummyjson (fe28861) with main (3bd3770)}

Summary

✅ 6 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.44%. Comparing base (3bd3770) to head (fe28861).
Report is 136 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2551      +/-   ##
==========================================
+ Coverage   89.42%   89.44%   +0.02%     
==========================================
  Files          58       58              
  Lines        4783     4783              
  Branches      933      933              
==========================================
+ Hits         4277     4278       +1     
+ Misses        353      352       -1     
  Partials      153      153              

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