[Backport v1.5] Fix: Akka.Remote should not shutdown on invalid TLS traffic#7952
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…et#7939) When TLS is enabled, invalid traffic (like HTTP requests) hitting the Akka.Remote port would cause the entire ActorSystem to shut down with exit code 79. This was due to overly aggressive TLS handshake failure handling introduced in akkadotnet#7839. Changes: - Modified TcpTransport to only trigger CoordinatedShutdown for client-side TLS handshake failures (outbound connections we initiate) - Server-side TLS failures (incoming invalid connections) now just log a warning and reject the connection without shutting down - Added test to verify servers remain running when invalid traffic hits the TLS port This makes Akka.Remote resilient to port scanners, misconfigured clients, or malicious traffic while maintaining strict security for legitimate connections. Fixes akkadotnet#7938
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Summary
Backport of #7939 to v1.5 branch.
Original PR: #7939