CAMEL-7271: GroupExchange in agg strategy should create a new exchange instread of copy, as then exceptions would be propagated which it shouldnt. Thanks to Luke Hamaty for unit test reproducing the issue.

Conflicts:
	camel-core/src/main/java/org/apache/camel/processor/aggregate/GroupedExchangeAggregationStrategy.java

Conflicts:
	camel-core/src/main/java/org/apache/camel/processor/aggregate/GroupedExchangeAggregationStrategy.java