Fix #138, Convert int32 return codes and variables to CFE_Status_t

[thnkslprpt]

Checklist

• I reviewed the Contributing Guide.
• I signed and emailed the appropriate Contributor License Agreement to [email protected] and copied [email protected].

Describe the contribution

• Fixes ci_lab int32 return codes and variables should be converted to CFE_Status_t #138
  • int32 return codes converted over to CFE_Status_t
  • a couple of int32 status/return variables holding cFE return codes converted to CFE_Status_t

Testing performed
GitHub CI actions all passing successfully.
Local testing with full cFS suite passing all tests and showing not change to coverage.

Expected behavior changes
No change to behavior.
CFE_Status_t is more expressive and improves consistency with cFE/cFS.

Contributor Info
Avi Weiss @thnkslprpt