How to run tests with the Panama Vector implementation

I previously used to do:

```
export CI=true; ./gradlew :lucene:core:test
```

but this is not enough, in the output we see:
```
WARNING: Vector bitsize and/or integer vectors enforcement; using default vectorization provider outside of testMode
```

because either or both of `tests.vectorsize` or `tests.forceintegervectors` is set.