Classify surviving deprecated APIs in storm-server, external modules, and utilities (#8994)

[Mohit20057]

What is the purpose of the change

Sub-task of umbrella issue #8994 ("inventory deprecated API and remove what is marked for removal").

This pull request classifies surviving @Deprecated declarations across storm-server, external/storm-hdfs, flux-core, and remaining storm-client utilities with explicit since = "..." and forRemoval = true/false decisions to provide clear lifecycle signals to users and downstream consumers without introducing breaking removals:

1. storm-server:

   • Testing.java: Marked legacy test-cluster inspection and cluster lifecycle methods forRemoval = true (since = "2.0.0").
   • SchedulerAssignmentImpl.java: Marked getStatus() forRemoval = false (since = "2.0.0") as it remains in active use by the web UI and Nimbus scheduler APIs.
   • BaseResourceAwareStrategy.java: Marked legacy scoring helper methods forRemoval = true (since = "2.0.0").
   • NodeSorter.java & NodeSorterHostProximity.java: Marked legacy sortAllNodes(...) without cluster context forRemoval = true (since = "2.4.0").

2. External modules (flux-core & storm-hdfs):

   • Flux.java: Marked obsolete CLI option constants (OPTION_LOCAL, OPTION_REMOTE, OPTION_SLEEP, OPTION_ZOOKEEPER) forRemoval = true (since = "2.0.0").
   • Configs.java: Marked 12 legacy HDFS spout configuration keys forRemoval = true (since = "2.0.0").
   • HdfsState.java: Marked HdfsFileOptions#addRotationAction(RotationAction) forRemoval = true (since = "2.0.0").

3. storm-client utilities & security:

   • PlainSaslTransportPlugin.java, PlainClientCallbackHandler.java, SaslPlainServer.java: Added Javadoc deprecation notes and marked insecure test-only plain SASL provider classes forRemoval = true (since = "2.0.0").
   • StormMetricRegistry.java: Marked gauge(..., port) overload forRemoval = true (since = "2.3.0").
   • StormReporter.java: Marked prepare(MetricRegistry, ...) forRemoval = true (since = "2.3.0").
   • LinearDRPCTopologyBuilder.java: Marked addBolt(IRichBolt, ...) forRemoval = true (since = "2.0.0").

How was this tested

• Built and compiled storm-server, storm-client, storm-hdfs, and flux-core with JDK 23
• Checkstyle passed with 0 violations across all modified modules
• Unit test verification:
  • storm-server: TestResourceAwareStrategy (14/14 tests passed)
  • storm-client: TestConfigValidate (38/38 tests passed)
  • external/storm-hdfs: ConfigsTest (2/2 tests passed)
  • flux/flux-core: TCKTest#testTCK (1/1 tests passed)