chore(tesseract): Mocks for pre-aggregations tests

[waralexrom]

Check List

• Tests have been run in packages where changes have been made if available
• Linter has been run for changed code
• Tests for the changes have been added if not covered yet
• Docs have been added / updated if required

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.99%. Comparing base (fd8a312) to head (d164cbf).
⚠️ Report is 16 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #10372   +/-   ##
=======================================
  Coverage   77.99%   77.99%           
=======================================
  Files         469      469           
  Lines       91781    91781           
  Branches     3539     3539           
=======================================
  Hits        71582    71582           
  Misses      19704    19704           
  Partials      495      495           

Flag	Coverage Δ
cube-backend	55.16% <ø> (ø)
cubesql	83.29% <ø> (ø)

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