Run code coverage like other Tinkerbell projects

[jacobweinstock]

Description

I'm seeing weirdness with the current codecov. Non Go files are affecting the coverage reported by codecov. Using the bash script upload instead of the GitHub action.

Why is this needed

Fixes: #

How Has This Been Tested?

How are existing users impacted? What migration steps/scripts do we need?

Checklist:

I have:

• updated the documentation and/or roadmap (if required)
• added unit or e2e tests
• provided instructions on how to upgrade

[codecov]

Codecov Report

Merging #43 (138d0ed) into main (9d47c4b) will decrease coverage by 0.41%.
Report is 1 commits behind head on main.
The diff coverage is n/a.

❗ Current head 138d0ed differs from pull request most recent head 27bc569. Consider uploading reports for the commit 27bc569 to get more accurate results

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
- Coverage   92.30%   91.89%   -0.41%     
==========================================
  Files          11       11              
  Lines        1052      814     -238     
==========================================
- Hits          971      748     -223     
+ Misses         60       43      -17     
- Partials       21       23       +2     

see 9 files with indirect coverage changes

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