[PR] chore(stream): remove dead ActorProcessor, ActorProcessorImpl, and ExposedPublisherReceive [pekko]

["He-Pin (via GitHub)" <gi...@apache.org>]

He-Pin opened a new pull request, #3027:
URL: https://github.com/apache/pekko/pull/3027

   ### Motivation
   
   `ActorProcessor`, `ActorProcessorImpl`, and `ExposedPublisherReceive` are `@InternalApi` classes that were part of the legacy actor-based stream runtime. After the GraphStage migration (issue #2860), these classes are completely dead code:
   
   - `ActorProcessor` class + object: never instantiated anywhere in the codebase
   - `ActorProcessorImpl` abstract class: never extended by any subclass
   - `ExposedPublisherReceive`: only used by the dead `ActorProcessorImpl`
   
   ### Modification
   
   - Remove `ActorProcessor` class and object (lines 31-60 of `ActorProcessor.scala`)
   - Remove `ActorProcessorImpl` class and object (lines 265-330 of `ActorProcessor.scala`)
   - Remove `ExposedPublisherReceive.scala` entirely (43 lines)
   - Clean up unused imports (`AbruptTerminationException`, `ActorAttributes`, `Processor`, `Subscription`)
   - Add MiMa exclusion filters for the removed `@InternalApi` classes
   
   ### Result
   
   -147 lines of dead code removed. `BatchingInputBuffer` and `SimpleOutputs` remain in `ActorProcessor.scala` (still used by `FanIn`/`FanOut` for `TLSActor`).
   
   ### Tests
   
   - `stream/compile`: passes
   - `stream/mimaReportBinaryIssues`: passes (with exclusions)
   - `stream/headerCheckAll`: passes
   - stream-tests (FlowSpec, SourceSpec, SinkSpec, PublisherSinkSpec): 166/166 pass
   
   ### References
   
   Refs #2860


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Re: [PR] chore(stream): remove dead ActorProcessor, ActorProcessorImpl, and ExposedPublisherReceive [pekko]

["He-Pin (via GitHub)" <gi...@apache.org>]

He-Pin merged PR #3027:
URL: https://github.com/apache/pekko/pull/3027


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