Make tests work with Java 23 (#723)

Example stack trace from Java 23:

```
getSubject is supported only if a security manager is allowed
java.lang.UnsupportedOperationException: getSubject is supported only if a security manager is allowed
	at java.base/javax.security.auth.Subject.getSubject(Subject.java:347)
	at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:588)
	at org.apache.hadoop.fs.FileSystem$Cache$Key.<init>(FileSystem.java:3888)
	at org.apache.hadoop.fs.FileSystem$Cache$Key.<init>(FileSystem.java:3878)
	at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:3666)
	at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:557)
	at org.apache.hadoop.fs.Path.getFileSystem(Path.java:366)
	at org.apache.iceberg.hadoop.Util.getFs(Util.java:56)
	at org.apache.iceberg.hadoop.HadoopOutputFile.fromPath(HadoopOutputFile.java:53)
	at org.apache.iceberg.hadoop.HadoopFileIO.newOutputFile(HadoopFileIO.java:97)
	at org.apache.polaris.service.dropwizard.catalog.io.TestFileIO.newOutputFile(TestFileIO.java:114)
	at org.apache.iceberg.BaseMetastoreTableOperations.writeNewMetadata(BaseMetastoreTableOperations.java:155)
	at org.apache.iceberg.BaseMetastoreTableOperations.writeNewMetadataIfRequired(BaseMetastoreTableOperations.java:150)
	at org.apache.polaris.service.catalog.BasePolarisCatalog$BasePolarisTableOperations.doCommit(BasePolarisCatalog.java:1343)
	at org.apache.iceberg.BaseMetastoreTableOperations.commit(BaseMetastoreTableOperations.java:125)
	at org.apache.iceberg.BaseMetastoreCatalog$BaseMetastoreCatalogTableBuilder.create(BaseMetastoreCatalog.java:201)
	at org.apache.iceberg.rest.CatalogHandlers.createTable(CatalogHandlers.java:274)
	at org.apache.polaris.service.catalog.PolarisCatalogHandlerWrapper.lambda$createTableDirect$13(PolarisCatalogHandlerWrapper.java:588)
	at org.apache.polaris.service.catalog.PolarisCatalogHandlerWrapper.doCatalogOperation(PolarisCatalogHandlerWrapper.java:517)
	at org.apache.polaris.service.catalog.PolarisCatalogHandlerWrapper.createTableDirect(PolarisCatalogHandlerWrapper.java:588)
	at org.apache.polaris.service.catalog.IcebergCatalogAdapter.createTable(IcebergCatalogAdapter.java:258)
	at org.apache.polaris.service.catalog.api.IcebergRestCatalogApi.createTable(IcebergRestCatalogApi.java:205)
	at org.apache.polaris.service.dropwizard.admin.PolarisOverlappingTableTest.createTable(PolarisOverlappingTableTest.java:61)
	at org.apache.polaris.service.dropwizard.admin.PolarisOverlappingTableTest.testTableLocationRestrictions(PolarisOverlappingTableTest.java:153)
```

Note that `javax.security.auth.Subject#getSubject` is deprecated for removal since Java 17.

`java.lang.System#initPhase3` shows that setting `java.security.manager` to `allow` works around the UOE.

Author: snazy

quarkus/service/build.gradle.kts

@@ -146,7 +146,9 @@ tasks.named<Test>("test").configure {
   // Note: the test secrets are referenced in DropwizardServerManager
   environment("POLARIS_BOOTSTRAP_CREDENTIALS", "POLARIS,root,test-admin,test-secret")
   jvmArgs("--add-exports", "java.base/sun.nio.ch=ALL-UNNAMED")
-  useJUnitPlatform()
+  // Need to allow a java security manager after Java 21, for Subject.getSubject to work
+  // "getSubject is supported only if a security manager is allowed".
+  systemProperty("java.security.manager", "allow")
   maxParallelForks = 4
 }