Avoid codecov report uploads for all the tests in Github actions

[czgdp1807]

Description of the problem

I think uploading code coverage step should only be available for ubuntu-latest and python 3.8. For the rest only tests and documentation build should be run. As of now all the 12 tests send request to codecov leading to editing of the codecov comments several times. Basically we need to decouple the yml script to make this happen. See the edit history of #452 (comment)

Example of the problem

References/Other comments

cc: @HarshCasper