fix(client): don't leak private properties to typings (#14003)
fix(client): don't leak private properties to typings (#14003)

This fixes ecosystem-tests breakage:

```
Error: 5410a1bef9807f666cd92a0d2020f700e67e4096@prisma/client/runtime/index.d.ts(1214,5): error TS18028: Private identifiers are only available when targeting ECMAScript 2015 and higher.
```
prisma/prisma,prisma/prisma,prisma/prisma