Add reusable workflow for application unit test and coverage enforcement

[skliper]

Checklist (Please check before submitting)

• I reviewed the Contributing Guide.
• I reviewed the cFS README.md file to see if the feature is in the major future work.
• I performed a cursory search to see if the feature request is relevant, not redundant, nor in conflict with other tickets.

Is your feature request related to a problem? Please describe.
There's a common recipe for unit testing and coverage enforcement for the GSFC apps that are Draco dev cycle compatible, but they don't currently have a workflow implemented.

Describe the solution you'd like
Add a reusable workflow at the cFS level to keep things consistent and avoid logic duplication.

Describe alternatives you've considered
None

Additional context
None

Requester Info
Jacob Hageman - NASA/GSFC