Use CodeCov for test coverage #6045

Job	Run time
Unit tests with race condition detection	9m 31s
Unit Tests	9m 9s
Lint	7m 1s
Proxy Sanity Check	2m 23s
Performance Tests	12m 53s
Build Unsigned Snapshot	23m 35s
Integration Tests - Official Plus Images	0s
Integration Tests	0s
Upgrade Tests	0s
Metrics Integration Tests - Official OSS Images	0s
Integration Tests - Official OSS Images	0s
Metrics Integration Tests - Official Plus Images	0s
Load Tests	0s
	1h 4m 32s

Provide feedback