[receiver_creator] Fix kafkametrics receiver instantiation #39395
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Description
Fix dynamic start of kafka metrics receiver
Link to tracking issue
Fixes #39313. The issue is caused by adding the custom unmarshaler to the kafka metrics receiver, specifically this line. The extra
Unmashall
call seems to be redundant. However, it's an establish practice in other receivers. So I don't want to change that yet. The change inreceiver_creator
also resolves the problem and doesn't have any side effects.Testing
Follow reproducing steps from the issue