build(deps): remove unused j2objc-annotations and curator-test dependencies

[ashwintumma23]

Summary

Removes two unused third-party dependencies (com.google.j2objc:j2objc-annotations
and org.apache.curator:curator-test) from modules where static analysis confirmed
zero source usage, reducing attack surface and license exposure.

Release note

Removed unused com.google.j2objc:j2objc-annotations from root dependencyManagement
and org.apache.curator:curator-test from 4 modules (embedded-tests,
rabbit-stream-indexing-service, druid-catalog, lookups-cached-global) where
no source usage was found.

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Key changed/added classes in this PR

• pom.xml
• embedded-tests/pom.xml
• extensions-contrib/rabbit-stream-indexing-service/pom.xml
• extensions-core/druid-catalog/pom.xml
• extensions-core/lookups-cached-global/pom.xml
• licenses.yaml

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Reason for change

Keeping unused third-party dependencies increases attack surface and license exposure
without benefit. Static analysis flagged both artifacts as unused, and manual
investigation confirmed zero source imports in the affected modules.

curator-test remains declared in the 4 modules that actively use it (server,
indexing-service, kafka-indexing-service, kafka-extraction-namespace) and in
root dependencyManagement for version pinning.

j2objc-annotations is already managed by the Guava BOM (already imported), so the
explicit dependencyManagement pin was a redundant no-op.

Changes

1. pom.xml (1 entry removed)

• Removed com.google.j2objc:j2objc-annotations version 3.1 from
  dependencyManagement — redundant, as the Guava BOM already pins this artifact
  at the same version.

2. embedded-tests/pom.xml (1 entry removed)

• Removed unused org.apache.curator:curator-test test-scope dependency — zero
  curator.test / TestingServer / TestingCluster imports in source.

3. extensions-contrib/rabbit-stream-indexing-service/pom.xml (1 entry removed)

• Removed unused org.apache.curator:curator-test test-scope dependency — zero
  curator.test imports in source.

4. extensions-core/druid-catalog/pom.xml (1 entry removed)

• Removed unused org.apache.curator:curator-test test-scope dependency — zero
  curator.test imports in source.

5. extensions-core/lookups-cached-global/pom.xml (1 entry removed)

• Removed unused org.apache.curator:curator-test test-scope dependency (including
  its stale javassist exclusion) — zero curator.test imports in source.

6. licenses.yaml (2 sections removed)

• Removed j2objc entry for core module.
• Removed j2objc entry for extensions/protobuf-extensions module.

Tests

• Verified zero com.google.j2objc and curator.test imports in all affected
  module source trees
• curator-test remains declared and available in the modules that actively use it
• No compile-time or runtime references to removed artifacts exist in the
  affected modules