feat(security): add UserPermissionEvaluator

so S3ArtifactStoreGetter can call a username-based hasPermission method.
FiatPermissionEvaluator has this method, but using FiatPermissionEvaluator in kork would
create a circular dependency.

The plan is:

- publish a kork jar with UserPermissionEvaluator,
- consume it in fiat and change FiatPermissionEvaluator to implement UserPermissionEvaluator instead of PermissionEvaluator
- publish a fiat jar and consume it everywhere
- change S3ArtifactStoreGetter to use UserPermissionEvaluator to fix the bug that #1178 demonstrates
- publish yet another kork jar and consume it everywhere to fix use of fetchReference in Evaluate Variables stages

kork-security/src/main/java/com/netflix/spinnaker/security/UserPermissionEvaluator.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2024 Salesforce, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.netflix.spinnaker.security;
+
+import java.io.Serializable;
+import org.springframework.security.access.PermissionEvaluator;
+
+/**
+ * Make it possible to authorize by username in kork (e.g. in S3ArtifactStoreGetter), as
+ * FiatPermissionEvaluator currently does.
+ */
+public interface UserPermissionEvaluator extends PermissionEvaluator {
+
+  boolean hasPermission(
+      String username, Serializable resourceName, String resourceType, Object authorization);
+}