Try to switch to llvm-cov for coverage

[ChristopherRabotin]

Effects

Codecov seems to have issues with open-source projects, so I'm not sure if this will work.

If this is a new feature or a bug fix ...

• Yes, the branch I'm proposing to merge is called issue-xyz where xyz is the number of the issue.

If this change adds or modifies a validation case

• No.
• Yes and:
  • I have coded up, or updated, an existing test case; and
  • I have provided a GMAT script which confirms the result(s); and
  • I have updated the VALIDATION.md file with the new error data between nyx and GMAT.
  • I will specify the version of GMAT used for the validation.

[github-actions]

Visit the preview URL for this PR (updated for commit b9072be):

https://nyx-rustdoc--pr314-hotfix-daily-run-w7bj5t83.web.app

_{(expires Fri, 28 Jun 2024 07:18:37 GMT)}

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_{Sign: d8e2a55934352d850c15d11866c39eb2d2e029be}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 22.78%. Comparing base (657eb6e) to head (b9072be).
Report is 322 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #314       +/-   ##
===========================================
- Coverage   66.76%   22.78%   -43.98%     
===========================================
  Files         127       81       -46     
  Lines       32629    12711    -19918     
===========================================
- Hits        21784     2896    -18888     
+ Misses      10845     9815     -1030     

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