Follow-up of recent GraalVM update #7176 that fixes downloading of GraalVM for Mac - instead of "darwin", the releases are now named "macos"
# Important Notes
Also re-enables the JDK/GraalVM version check as onLoad hook to the `sbt` process. We used to have that check a long time ago. Provides errors like this one if the `sbt` is run with a different JVM version:
```
[error] GraalVM version mismatch - you are running Oracle GraalVM 20.0.1+9.1 but GraalVM 17.0.7 is expected.
[error] GraalVM version check failed.
```
