Fix creation of coverage report folder

[jsoriano]

Current code is creating the build/test-coverage/coverage-unit-report folder that is never used. Create build/test-coverage instead.

[elasticmachine]

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• Start Time: 2022-03-18T13:44:51.542+0000

• Duration: 18 min 43 sec

Test stats 🧪

Test	Results
Failed	0
Passed	582
Skipped	1
Total	583

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