Add unit test coverage indicator as part of Continuous Integration.

[atulai-sg]

We should have a unit test coverage indicator to help identify developers whether or not they have increased or decreased coverage as part of their changes.

[bashir2]

Thanks @atulai-sg for adding codecov back to our CB flow. I am reopening this issue to investigate the inconsistencies you reported in coverage numbers. Please feel free to close this and open another issue if that is more appropriate.

[atulai-sg]

Hi @bashir2, I believe the inconsistencies can be tackled post beta.

[bashir2]

Sounds good @atulai-sg I moved this to the post-beta follow-ups.

[bashir2]

Hi @atulai-sg, just checking if you are planning to continue working on this and address review comments of #838? If not, please unassign this issue.

[bashir2]

With PR #973, it seems that we now have coverage numbers reported in Codecov, e.g., here for master and here for a sample PR.