Simplify settings.gradle.kts

[runningcode]

📜 Description

This also adds the version catalog to the buildSrc build in order to reduce redeclaration of dependencies.

The included builds automatically add these dependency substitution rules: https://docs.gradle.org/current/userguide/composite_builds.html#included_build_declaring_substitutions

#skip-changelog

💡 Motivation and Context

💚 How did you test it?

📝 Checklist

• I reviewed the submitted code
• I added tests to verify the changes
• I updated the docs if needed
• No breaking changes

🔮 Next steps

[romtsn]

I knew this was possible :) great, thanks!