Authorized route migration for routes owned by @elastic/kibana-cloud-security-posture (#198189)

### Authz API migration for authorized routes

This PR migrates `access:<privilege>` tags used in route definitions to
new security configuration.
Please refer to the documentation for more information: [Authorization
API](https://docs.elastic.dev/kibana-dev-docs/key-concepts/security-api-authorization)

### **Before migration:**
Access control tags were defined in the `options` object of the route:

```ts
router.get({
  path: '/api/path',
  options: {
    tags: ['access:<privilege_1>', 'access:<privilege_2>'],
  },
  ...
}, handler);
```

### **After migration:**
Tags have been replaced with the more robust
`security.authz.requiredPrivileges` field under `security`:

```ts
router.get({
  path: '/api/path',
  security: {
    authz: {
      requiredPrivileges: ['<privilege_1>', '<privilege_2>'],
    },
  },
  ...
}, handler);
```

### What to do next?
1. Review the changes in this PR.
2. You might need to update your tests to reflect the new security
configuration:
  - If you have tests that rely on checking `access` tags.
  - If you have snapshot tests that include the route definition.
- If you have FTR tests that rely on checking unauthorized error
message. The error message changed to also include missing privileges.

## Any questions?
If you have any questions or need help with API authorization, please
reach out to the `@elastic/kibana-security` team.

---------

Co-authored-by: Paulo Silva <paulo.henrique@elastic.co>

x-pack/plugins/cloud_defend/server/routes/policies/policies.ts

@@ -60,8 +60,10 @@ export const defineGetPoliciesRoute = (router: CloudDefendRouter) =>
     .get({
       access: 'internal',
       path: POLICIES_ROUTE_PATH,
-      options: {
-        tags: ['access:cloud-defend-read'],
+      security: {
+        authz: {
+          requiredPrivileges: ['cloud-defend-read'],
+        },
       },
     })
     .addVersion(

x-pack/plugins/cloud_defend/server/routes/status/status.ts

@@ -218,8 +218,10 @@ export const defineGetCloudDefendStatusRoute = (router: CloudDefendRouter) =>
     .get({
       access: 'internal',
       path: STATUS_ROUTE_PATH,
-      options: {
-        tags: ['access:cloud-defend-read'],
+      security: {
+        authz: {
+          requiredPrivileges: ['cloud-defend-read'],
+        },
       },
     })
     .addVersion({ version: '1', validate: {} }, async (context, request, response) => {