Modified codecov config file and coverage configuration file #564

Job	Run time
Run unit test on cornflow-client (3.8, ubuntu-latest)	23s
Run unit test on cornflow-client (3.8, macOS-latest)	53s
Run unit test on cornflow-client (3.8, windows-latest)	1m 37s
Run unit test on cornflow-client (3.9, ubuntu-latest)	31s
Run unit test on cornflow-client (3.9, macOS-latest)	24s
Run unit test on cornflow-client (3.9, windows-latest)	1m 15s
Run unit test on cornflow-client (3.10, ubuntu-latest)	26s
Run unit test on cornflow-client (3.10, macOS-latest)	30s
Run unit test on cornflow-client (3.10, windows-latest)	1m 16s
Run unit test on cornflow-client (3.11, ubuntu-latest)	25s
Run unit test on cornflow-client (3.11, macOS-latest)	25s
Run unit test on cornflow-client (3.11, windows-latest)	1m 25s
Run all test suites on cornflow-client (3.8, ubuntu-latest)	6m 52s
Run all test suites on cornflow-client (3.9, ubuntu-latest)	6m 58s
Run all test suites on cornflow-client (3.10, ubuntu-latest)	6m 51s
Run all test suites on cornflow-client (3.11, ubuntu-latest)	6m 47s
	36m 58s

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