Fix #921, Update remaining cFE source/tests to use 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 update cFE source and unit tests to use CFE_Status_t #921
  • Remaining int32 return types converted to CFE_Status_t.

Testing performed
GitHub CI actions (incl. Build + Run, Unit Tests etc.) all passing successfully.

Expected behavior changes
No change to behavior/logic- CFE_Status_t is currently typedef'd to int32, so no functional change to any types with this PR.
Synchronizing the return types to CFE_Status_t simplifies the code, and makes it more type-safe.

Contributor Info
Avi Weiss @thnkslprpt

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