Integration tests failed randomly due to existing gradle Daemon

### Describe the bug

We need to stop the daemon first to make sure the integration test can test. We might just need to document this.
```
./gradlew --stop
```

### To Reproduce
To run Polaris server locally
```
./gradlew run
```
To trigger regression test in another terminal
```
./gradlew check
```

Start by reproducing the integration-test failure with ./gradlew run followed by ./gradlew check, then compare the result after running ./gradlew --stop. Review the Gradle integration-test setup and determine whether the completed work should document this prerequisite or prevent the existing daemon from causing failures.

Written by the indexing model from the issue text.