Fix #147, Add check for failure of `CFE_EVS_Register()` during initialization

[thnkslprpt]

Checklist

• [x] I reviewed the Contributing Guide.
• [x] 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 #147
  • Adds checks for failure during call to CFE_EVS_Register() in the initialization sequence.

Recommend refactoring TO_LAB_init() in future to avoid the need for these early returns.

Testing performed GitHub CI actions all passing successfully. Local tests confirm builds and run fine, and cFS tests all passing.

Expected behavior changes Use will be informed of failure of CFE_EVS_Register() rather than it failing silently.

System(s) tested on Debian GNU/Linux 11 (bullseye) Current main branch of cFS bundle.

Contributor Info Avi Weiss @thnkslprpt

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