fix flaky tests due to a blank database name, which fails in the test creator

Author: ThoSap

operator/src/test/java/it/aboutbits/postgresql/_support/testdata/persisted/creator/DefaultPrivilegeCreate.java

@@ -234,11 +234,23 @@ private String getSchema() {
             return withSchema;
         }
 
+        var databaseName = getDatabase();
+        if (databaseName.isBlank()) {
+            databaseName = given.one()
+                    .database()
+                    .withClusterConnectionName(getClusterConnectionName())
+                    .withClusterConnectionNamespace(withClusterConnectionNamespace)
+                    .withReclaimPolicy(DELETE)
+                    .returnFirst()
+                    .getSpec()
+                    .getName();
+        }
+
         var clusterConnectionDb = given.one()
                 .clusterConnection()
                 .withName(getClusterConnectionName() + "-db")
                 .withNamespace(withClusterConnectionNamespace)
-                .withDatabase(getDatabase())
+                .withDatabase(databaseName)
                 .returnFirst();
 
         var item = given.one()

operator/src/test/java/it/aboutbits/postgresql/_support/testdata/persisted/creator/GrantCreate.java

@@ -236,11 +236,23 @@ private String getSchema() {
             return withSchema;
         }
 
+        var databaseName = getDatabase();
+        if (databaseName.isBlank()) {
+            databaseName = given.one()
+                    .database()
+                    .withClusterConnectionName(getClusterConnectionName())
+                    .withClusterConnectionNamespace(withClusterConnectionNamespace)
+                    .withReclaimPolicy(DELETE)
+                    .returnFirst()
+                    .getSpec()
+                    .getName();
+        }
+
         var clusterConnectionDb = given.one()
                 .clusterConnection()
                 .withName(getClusterConnectionName() + "-db")
                 .withNamespace(withClusterConnectionNamespace)
-                .withDatabase(getDatabase())
+                .withDatabase(databaseName)
                 .returnFirst();
 
         var item = given.one()