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

[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 No notification of failure of CFE_EVS_Register() in TO_LAB_init() #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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[jphickey]

I would like to get these into the next round