[PR] test(acl): pin the remote policy projection null-safety [rocketmq-dashboard]

["zjncs (via GitHub)" <gi...@apache.org>]

zjncs opened a new pull request, #5739:
URL: https://github.com/apache/rocketmq-dashboard/pull/5739

   ### What
   
   `RemoteAclPolicyVO` — the REST representation of an Apache ACL 2.0 policy — had no test. This adds `RemoteAclPolicyVOTest` with 7 tests pinning the projection's whole job: **a sparse upstream answer never surfaces null lists or null rows to the API consumer**.
   
   ### What is pinned
   
   - a fully populated policy maps through every level (subject, policy type, entry resource/actions/sourceIps/decision);
   - a null `policies` list projects to empty;
   - null policy rows are filtered;
   - a null `entries` list projects to empty and null entry rows are filtered;
   - **null strings inside the typed `actions` and `sourceIps` lists are filtered** — the wire answer carries null slots, the REST answer must not;
   - a null `actions` or `sourceIps` list projects to an empty list, never null.
   
   ### Verification
   
   - New tests on unmodified code: **7/7 green**, checkstyle clean (`mvn test -Dtest=RemoteAclPolicyVOTest`).
   - Discriminating mutations on `RemoteAclPolicyVO`, build result verified red each time:
     1. the policy-level null-list guard dropped — red (NPE);
     2. the null-row filter dropped — red (null reaches the mapper);
     3. the string-list null filtering dropped — red (null actions surface to the REST answer).
   - Restored: 7/7 green. Test-only change; no product code touched.
   


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