Enable extension tests on CI

This change enables Spatial extension tests on GitHub CI runs. With
recent improvements in DuckDB engine vendoring process it is expected
that JDBC builds can only be done with engine version for that the full
set of prebuilt extensions is available, thus `INSTALL spatial` must
work.

Author: staticlibs

src/test/java/org/duckdb/TestDuckDBJDBC.java

@@ -3491,9 +3491,8 @@ public static void main(String[] args) throws Exception {
             Class<?> clazz = Class.forName("org.duckdb." + arg1);
             statusCode = runTests(new String[0], clazz);
         } else {
-            // extension installation fails on CI, Spatial test is temporary disabled
             statusCode = runTests(args, TestDuckDBJDBC.class, TestBatch.class, TestClosure.class,
-                                  TestExtensionTypes.class /*, TestSpatial.class */, TestParameterMetadata.class,
+                                  TestExtensionTypes.class, TestSpatial.class, TestParameterMetadata.class,
                                   TestPrepare.class, TestResults.class, TestTimestamp.class);
         }
         System.exit(statusCode);