Use codecov token & move codecov yaml

[JeffGreiner-eaton]

Fixes BLUI-5748.

Changes proposed in this Pull Request:

• move codecov.yml to GitHub folder and set the configuration with status checks and use the default PR comment from codecov
• use codecov token with upload action

Screenshots / Screen Recording (if applicable)

• see this PR for screen shot & calc Use codecov token & move codecov yaml blui-react-component-library#883

To Test:

Any specific feedback you are looking for?

[github-actions]

Visit the preview URL for this PR (updated for commit fac85de):

https://blui-react-login--pr594-feature-blui-5748-co-q7cwaop7.web.app

_{(expires Thu, 23 May 2024 11:40:57 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

_{Sign: 1e9064d2e35ed37fe01e053587ea5f209719a043}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.85%. Comparing base (3e83bd1) to head (fac85de).
Report is 39 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #594      +/-   ##
==========================================
+ Coverage   72.31%   72.85%   +0.54%     
==========================================
  Files          83       82       -1     
  Lines        1051     1050       -1     
  Branches      235      234       -1     
==========================================
+ Hits          760      765       +5     
+ Misses        120      115       -5     
+ Partials      171      170       -1     

Flag	Coverage Δ
unittests	72.85% <ø> (+0.54%)	⬆️

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