CMake hello world project requires project name to be a valid C language symbol name

[jld01]

Steps to reproduce with CDT main HEAD 2026-01-03:

1. Create a new CMake with hello world executable project named project-1
2. Build the project
3. Observe compilation failure in generated config.h due to hyphen in version macro name:

#define project-1_VERSION_MAJOR 0

Should we detect and warn about invalid C symbol characters in CMake project names in the project wizard?

[jld01]

Thinking more about this issue, I don't think we should impose project name restrictions on the user. It would be better to replace non-compliant characters when generating the version macro name.