Fix #90, 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 GSFC-SoftwareRelease@mail.nasa.gov and copied cfs-program@lists.nasa.gov.

Describe the contribution

• Fixes LC int32 return codes and variables should be converted to CFE_Status_t #90
  • most int32 return codes converted over to CFE_Status_t
  • int32 status/return variables holding cFE return codes converted to CFE_Status_t
  • removed the Status variable from LC_AppPipe() - it was not actually used - the function always returns CFE_SUCCESS as currently implemented

Testing performed
GitHub CI actions all passing successfully.

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

Contributor Info
Avi Weiss @thnkslprpt

[github-advanced-security]

CodeQL found more than 10 potential problems in the proposed changes. Check the Files changed tab for more details.

[chillfig]

Looks good!