Wait for all code coverage reports before calculating status

Configure codecov to wait for all 4 coverage reports (unit, generative,
integration, acceptance) before calculating status. To prevent
calculating results on incomplete reports (usually acceptance tests
finish after other test jobs, leading to false report).

Author: Acepresso

codecov.yml

@@ -24,3 +24,4 @@ coverage:
     project:
       cli:
         threshold: 5%
+        after_n_builds: 4