Add token and use v4

[mrp089]

Current situation

Closes #110.

Release Notes

Adopted Codecov rules from svFSIplus via codecov.yml and bump upload action to v4.

Documentation

Codecov becomes informative only and won't prevent merging a PR that drops coverage.

Testing

Let's see if the action runs.

Code of Conduct & Contributing Guidelines

• I agree to follow the Code of Conduct and Contributing Guidelines.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.82%. Comparing base (7c722a5) to head (4876b2c).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #111      +/-   ##
==========================================
- Coverage   87.52%   77.82%   -9.70%     
==========================================
  Files          51       52       +1     
  Lines        1964     2034      +70     
  Branches        0      259     +259     
==========================================
- Hits         1719     1583     -136     
- Misses        245      451     +206     

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[mrp089]

Works now as intended! The weird thing is it still uses tokenless upload:

evenName: pull_request
baseRef: SimVascular:master | headRef: mrp089:fix_codecov_110
==> Fork detected, tokenless uploading used

Maybe every user would need to add the token in their fork? In any case, I think this can be merged. @menon-karthik, once this is merged, update #109 to see the coverage.

[menon-karthik]

Ah I already merged #109 before seeing this! But it's ok, I will merge this now. Thanks @mrp089!