Fix #2561, send CMake message to stdout instead of stderr

[Codym48]

Checklist (Please check before submitting)

• 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
Fix #2561.

While executing the drac0-rc5 training exercises, I noticed on the first make prep call that the following message is printed to stderr

NOTE: Selected /home/cmartin/code/cFS/sample_defs/cpu1_cfe_es_startup.scr as source for cfe_es_startup.scr on cpu1

This seems like an informational message that would be more appropriate for stdout than stderr, so I added the STATUS keyword to the cmake message call.

Testing performed
Before change

make prep > stdout.log # observe NOTE printed to screen despite passing stdout to file

After change

rm -rf build
make prep > stdout.log # observe nothing printed to screen 🎉

Expected behavior changes

• API Change: None
• Behavior Change: One message that used to go to stderr now goes to stdout

System(s) tested on

• Hardware: PC
• OS: Ubuntu 22.04
• Versions: draco-rc5

Additional context
This is a bit of a trial balloon to feel out the cFS contribution process. I won't be offended if you close this Pull Request with no action. Thank you for your hard work on this product and its outstanding documentation!

Contributor Info - All information REQUIRED for consideration of pull request
Full name and company/organization/center of all contributors ("Personal" if individual work)

• Cody Martin (Personal contributor)

[Codym48]

FYI @jphickey as the last developer that touched this line