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MDC Context Propagation Fix for logbook-ktor Client (#2319)

* Release 4.0.4

* Development 4.1.0-SNAPSHOT

* MDC Context Propagation Fix for logbook-ktor Client

Response logging in LogbookClient happens in a launched coroutine that doesn't inherit MDC context, breaking traceId and other observability data.

The suggested fix changes `scope.launch { }`` → `scope.launch(coroutineContext) { }``

Also added `.minusKey(Job)` during context propagation to:
   - Keep: MDCContext, CoroutineDispatcher, CoroutineName, custom elements
   - Remove: Job (prevents the launched coroutine from having conflicting parents)

* remove MDC context cleanup duplication

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