### What?
Fixes type for the `select` property when having `strictNullChecks:
true` or `strict: true` in tsconfig.
### Why?
`select` should provide autocompletion for users, at this point it
doesn't work with this condtiion
### How?
Makes `collectionsSelect` and `globalsSelect` properties required in
`configToJSONSchema.ts`.
Fixes
https://github.com/payloadcms/payload/pull/8550#issuecomment-2452669237
4349b78a2b