permissions: add a discriminator type to Permission

Signed-off-by: Mike Lewis <mtlewis@users.noreply.github.com>

packages/test-utils/src/testUtils/apis/PermissionApi/MockPermissionApi.test.ts

@@ -16,7 +16,7 @@
 
 import {
   AuthorizeResult,
-  Permission,
+  createPermission,
 } from '@backstage/plugin-permission-common';
 import { MockPermissionApi } from './MockPermissionApi';
 
@@ -25,7 +25,9 @@ describe('MockPermissionApi', () => {
     const api = new MockPermissionApi();
 
     await expect(
-      api.authorize({ permission: { name: 'permission.1' } as Permission }),
+      api.authorize({
+        permission: createPermission({ name: 'permission.1', attributes: {} }),
+      }),
     ).resolves.toEqual({ result: AuthorizeResult.ALLOW });
   });
 
@@ -37,7 +39,9 @@ describe('MockPermissionApi', () => {
     );
 
     await expect(
-      api.authorize({ permission: { name: 'permission.2' } as Permission }),
+      api.authorize({
+        permission: createPermission({ name: 'permission.2', attributes: {} }),
+      }),
     ).resolves.toEqual({ result: AuthorizeResult.DENY });
   });
 });