fix(newm-chain): STUD-499 newm-chain hang in kogmios shutdown (tweak)

[AndrewWestberg]

No description provided.

[Copilot]

Pull Request Overview

This pull request fixes a hang issue in newm-chain shutdown by properly handling coroutine cancellation in the kogmios client. The change ensures that CancellationExceptions are rethrown to maintain proper coroutine cancellation chain behavior during shutdown.

• Adds proper CancellationException handling to prevent shutdown hangs
• Imports CancellationException from kotlin.coroutines.cancellation package
• Maintains coroutine cancellation semantics by rethrowing CancellationException

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