Fix #511, adds lcov to archived results

[chillfig]

Checklist (Please check before submitting)

• I reviewed the Contributing Guide.
• I signed and emailed the appropriate Contributor License Agreement to GSFC-SoftwareRelease@mail.nasa.gov and copied cfs-program@lists.nasa.gov.

Describe the contribution

• Fixes Add lcov to archive results in unit-test-coverage.yml #511

Testing performed
Tested on forked nasa/CS commit using the github workflow changes from this pull request: https://github.com/chillfig/CS/actions/runs/2870659607

Expected behavior changes
The code coverage report (index.html) is accessible from the github workflow call.

System(s) tested on

• Ubuntu 18.04

Additional context
None

Code contributions
The cFS repository is provided to bundle the cFS Framework. It is utilized for bundling submodules, continuous integration testing, and version management and does not contain any software. Code contributions should be directed to the appropriate submodule.

Contributor Info - All information REQUIRED for consideration of pull request
Justin Figueroa, ASRC Federal