Don't generate html report in code coverage

[paladox]

Drops it similar to SMW to speed up.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 40.29%. Comparing base (7517c40) to head (8ddd926).

Additional details and impacted files

@@ Coverage Diff @@ ## master #997 +/- ## ========================================= Coverage 40.29% 40.29% Complexity 2426 2426 ========================================= Files 81 81 Lines 9200 9200 ========================================= Hits 3707 3707 Misses 5493 5493 

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