#242 fix codecov calc and upload

[k-doering-NOAA]

What is the feature?

Fix calculating and pushing code coverage reports to codecov.io. Addresses #242

How have you implemented the solution?

• Turns on the call-calc-coverage.yml workflow that uses covr::codecov()
• This calculates the coverage for both R and C++ code
• Remove the code coverage step from run-googletest.yml, since it was not doing what it was supposed to.
• Note I'm not sure if the build triggers are what we want or not - right now, it runs on every push and manually, but maybe only running to every push on main and on pull requests to main (and manually) are necessary?

Does the PR impact any other area of the project?

Not directly

How to test this change

• Verify that only 1 report is uploaded: https://app.codecov.io/github/NOAA-FIMS/FIMS/commit/6715b979ceeb361ed5960df210ac912cf28dd562
• See that the codecov includes both R and C++ code (yay!): https://app.codecov.io/github/NOAA-FIMS/FIMS/tree/242-fix-codecov-rebased

Developer pre-PR checklist

• I relied on GitHub actions to 🧪 things for me while I sat on the 🛋️.

[Bai-Li-NOAA]

Looks great! I agree with your suggestions. I think only running to every push on main and on pull requests to main (and manually) are necessary.

[k-doering-NOAA]

Thanks @Bai-Li-NOAA ! I added the build triggers, and also excluded some paths when coverage should not be expected to change (e.g.,changes only to the README).

I also realized it might be helpful to have codecov add a comment to our pull requests with information about coverage, so I turned on the option.